Regarding the found date
From The Lost Media Wiki
Bootlegs of this episode were floating around back in the 90s, well before 2003. The VHS bootlegs often contained this, the uncut pilot version of Big House Blues, premiere broadcasts of regular episodes before they were cut for either time or content, as well as workprints with timestamps and pencil tests. Many of these tapes are actually up on MySpleen. In fact. three of these tapes were produced in-house at Spumco, according to this tweet: https://twitter.com/RareHomeMedia/status/1326392264709566465