Question: When did Slug and Ant release a mixtape through Rhymesayers Entertainment?

Context articles: Strictly Leakage
Rhymesayers Entertainment
Us (Brother Ali album)
The Dynospectrum
Atmosphere (music group)
Slug (rapper)
Champion (EP)
Sad Clown Bad Summer 9
The Undisputed Truth (Brother Ali album)
Overcast! (album)

Strictly Leakage is a mixtape by American hip hop group Atmosphere.
 It was released as a free download through Rhymesayers Entertainment in 2007.
Rhymesayers Entertainment (sometimes abbreviated as RSE) is an American hip hop Independent record label based in Minneapolis, Minnesota.
 It was co-founded in 1995 by Sean Daley (Slug), Anthony Davis (Ant), Musab Saad (Sab the Artist) and Brent Sayers (Siddiq).
 Beginning in 2008, Rhymesayers Entertainment sponsors the annual Soundset Music Festival, a popular attraction that takes place over Memorial Day weekend in Minneapolis, MN.
Us is a studio album by American rapper Brother Ali.
 It was released on Rhymesayers Entertainment on September 22, 2009.
 The album is entirely produced by Ant.
The Dynospectrum is a studio album by The Dynospectrum, a collaboration between Slug, I Self Devine, Sab the Artist, and Swift.
 They performed under the pseudonyms Sept Sev Sev Two, Pat Juba, General Woundwart, and Mr. Gene Poole, respectively.
 The production was handled by Ant, who assumed the name Solomon Grundy for the project.
 It was released on Rhymesayers Entertainment on March 1, 1998.
Atmosphere is an American hip hop duo from Minneapolis, Minnesota, consisting of rapper Slug (Sean Daley) and DJ/producer Ant (Anthony Davis).
 Since its formation in 1989, the group has released eight studio albums and ten extended plays.
Sean Michael Daley (born September 7, 1972), better known by his stage name Slug, is an American rapper from Minneapolis, Minnesota.
 Slug is best known as one half of the hip hop group Atmosphere, which he founded with Derek Turner (Spawn).
 Turner has since left and Anthony Davis (Ant) produces Atmosphere with Slug.
 In 1995, Slug, in collaboration with Anthony Davis, Musab Saad, and Brent Sayers founded the Minneapolis-based independent hip hop record label Rhymesayers Entertainment.
Champion EP is Brother Ali's third release.
 The 9-song EP was released on Rhymesayers Entertainment on May 11, 2004 and is produced by Ant of Atmosphere.
Sad Clown Bad Summer 9 is a 5-track EP that was released on August 21, 2007 by Minneapolis hip hop duo Atmosphere under their own label Rhymesayers Entertainment.
 This EP was released to hold listeners over while Slug and Ant put the finishing touches on their LP "When Life Gives You Lemons, You Paint That Shit Gold", that was released on April 22, 2008.
The Undisputed Truth is the third studio album by American hip hop artist Brother Ali, his second major release.
 It was released on April 10, 2007 on Rhymesayers Entertainment.
 The album is produced entirely by Ant of Atmosphere.
 The first single, "Truth Is", was released on January 9, 2007.
 The second single is "Uncle Sam Goddamn".
Overcast!
 is the debut studio album by Minneapolis hip hop group Atmosphere, released in August 5, 1997 on Rhymesayers Entertainment.
 It's the only Atmosphere album to feature MC Spawn trading verses with Slug.
 Before the album's release, Spawn left the group due to conflicting motives.