When was the Chex Quest 3 bootleg released?

[Technopeasant]

Hello, I am trying to puzzle out the release window for the old Chex Quest 3 bootleg. Several sources indicate a 1998 release date, but the files in the widely available version all of have datestamps from 2000 and 2001. All of the WADs whose assets were utilized were available by 1998, with the Ghostbusters TC demo releasing in September. Does anyone have a good memory for when it first appeared?