MUSKEGON, MI – An army of online researchers answered the Muskegon Postmaster's call for help this week, solving a mail mystery in short order. 
 
 In a recent MLive Muskegon Chronicle article, Postmaster William Rowe asked for help to locate a family member qualified to open a World War II-era letter. The letter, originally mailed in 1945 by Army Sgt. Myron C. Cook, recently re-appeared in the mail – apparently unopened and bearing a September 2013 postmark from the Minneapolis, Minn., area. 
 
 Rowe said Thursday afternoon, May 15, that with online researchers' help, he had identified a Winter Haven, Fla. teacher, Nancy Sensabaugh Baker, as a granddaughter of the original recipients. 
 
 "We did find the granddaughter of the Sensabaughs," he said. 
 
 Emails and tips from around the country -- about 400 in all -- helped the search. 
 
 "This thing's gone all through Facebook and everything," Rowe said. "Without that media contact, it would have been impossible to track her." 
 
 Reached at her home Thursday, Baker said she was pleasantly surprised by the news. Two people had tipped her off about the letter before the postmaster had called, she said. 
 
 "A friend contacted me through Facebook and asked if I had seen this," she said. "(I) could not believe it, actually." 
 
 Among one of hundreds of online tipsters aiding in the search was Suzan Harrell of Lakeland, Fla. -- an acquaintance of Baker's and former Muskegon resident, who recognized the Sensabaugh name. 
 
 "I am sure that she would have been found without my input (people were searching genealogy, obituaries, etc.), but I am still amazed at the odds that I would see the article and recognize the name," Harrell said. 
 
 Baker is the daughter of Edward Lee Sensabaugh, a World War II Navy veteran. She remembers briefly living in her grandparents home on Washington Avenue in Muskegon's Nelson Neighborhood. 
 
 "We stayed there for a short time when my father was transferred to Michigan," she said. She lived in the home while in first and second grade during the early 60s. Her parents later moved to Florida. 
 
 Baker said she had several old letters from her grandparents but they aren't helping her to guess at the newly-found, unopened letter's contents. 
 
 "I have no idea," she said. She remembers that her grandparents were friends with man named Myron Cook, but she can't remember any details about their relationship. 
 
 "I'll just be anxious to see it," she said. "It's really a neat thing to see something from the past." 
 
 Rowe didn't know how this letter had been separated from the others, stayed sealed and returned to the mail stream after so many years. 
 
 He plans to send the letter to her via priority-express mail sometime next week, he said. ||||| UPDATE: A lot of new information has come up since this classic story was published in May 2014. Here are some of the other stories we wrote about the letter: 
 
 Unopened WWII-era letter's rescuer: 'I just couldn't send it down the normal channels' 
 
 Mail mystery: Florida woman to open World War II-era letter meant for her grandparents 
 
 Mail Mystery: More questions after World War II-era envelope opened by recipients' family member 
 
 Peg West: Readers were fascinated by an enduring mail mystery with some modern twists 
 
 
 
 MUSKEGON, MI – Postmaster William Rowe is searching for the relatives of long-gone recipients after an unopened World War II-era letter turned up in the mail recently. 
 
 The letter was originally addressed to a "Mr. and Mrs. Sensabaugh" at a Washington Avenue home in Muskegon that's now empty, and bore an initial postmark from a 1945 Army Post Office. The return address listed the letter's sender as Sgt. Myron C. Cook, with the letter traveling through the New York city post office at one time. 
 
 There was a more recent postmark on the letter -- from Minneapolis 2013 – printed over the old. 
 
 "We think somebody put it back into the mail stream," Rowe said. 
 
 A vintage sealing material on the back of the letter makes him think the letter has never been opened. 
 
 "We're not going to disturb it until we can see if we can find the family first," said secretary Veronica Mauseth. 
 
 Rowe and Mauseth said the letter was saved from the ordinary "dead mail" pile by a mail carrier who realized that the letter was mailed from an Army base during World War II. The mail carrier – a veteran of the Iraq war – realized that the letter had an interesting story. 
 
 Hoping to find clues into the letter's past, the post office reached out to Richard Mullally, who for years has been documenting the history of Muskegon County's World War II Veterans. 
 
 "I get some pretty unusual requests," Mullally said. 
 
 Mullally said he had a photo and record of a World War II-era Navy veteran named Edward Lee Sensabaugh. He said the last name was a rare one. He planned to do some more research into Cook and Sensabaugh's history. 
 
 Readers with information about the letter, its sender or recipients are invited to email the postmaster at william.j.rowe@usps.gov.
– Just where a World War II letter has been for nearly 70 years is a mystery, but it's finally on its last journey home. The letter—sent by Army Sgt. Myron Cook to a Muskegon, Mich., address from an army base in Europe, WZZM reports—somehow re-entered the mail system last fall in Minneapolis, still unopened. Bearing a 1945 Army Post Office postmark, it was addressed to a Mr. and Mrs. Sensabaugh. The envelope has since been somewhat altered: a September 2013 Minneapolis postmark is now stamped on it, and someone added a zip code—something that didn't exist in 1945. But the Sensabaugh's former home is vacant, and the letter typically would have ended up in the "dead mail" pile. But as Michigan Live reports, a mail carrier noticed the unusual date, and a search for the letter's rightful owner was sparked. Thanks to online researchers and some 400 tips, the couple's granddaughter, Nancy Sensabaugh Baker, has now been tracked down in Florida. "A friend contacted me through Facebook and asked if I had seen this," she told Michigan Live, adding she "could not believe it, actually." Baker, who lived with her grandparents in Muskegon for a time in the early 1960s, says she remembers they were friends with a man named Myron Cook, but she has "no idea" what the letter might say. "I'll just be anxious to see it," she says. "It's really a neat thing to see something from the past." The letter is expected to arrive next week.