Conversation so far:
Did Hardy Rodenstock own any wine from Thomas jefferson's vineyard?
In 1985, Hardy Rodenstock came into possession of his most famous bottles. The bottles were engraved with the initials Th. J., which was an indication that they belonged to Thomas Jefferson.
How does bottles engraved with the initials Th. J., which was an indication that they belonged to Thomas Jefferson relate to Hardy Rodenstock?
Rodenstock put one of the Th. J. bottles up for auction.
So Hardy Rodentsock sold in auction the bottles once owned by Thomas Jefferson to Bill Koch for how much?
Bill Koch paid a total of about 500,000 U.S. dollars for them.
Were the bottles once owned by Thomas Jeffereson sold by Hardy Rodenstock in auction to Bill Koch altered?
What did the team hired by Bill Koch found with regards of the bottles once owend by Thomas Jefferson and sold in auction by Hardy Rodenstock?
The Thomas Jefferson Foundation was contacted. The foundation's curator replied that based on Jefferson's records, the foundation didn't think that the bottles had been in the possession of Thomas Jefferson.

Question: When was this investigation launched?
Self-contained rewrite: When was the investigation about the bottles once owned by Thomas Jeffereson sold by Hardy Rodenstock in auction to Bill Koch launched?