Members of Negativland were given the Casey tape by a fan in Portland Oregon where they were performing at the time. I think even THEY (the band) preserve the anonymity of the donor of the tape to this day.
Negativland - many years after the Casey/U2/SST Records (their own record label sued them for legal costs) debacle - released a CD entitled These Guys Are From England And Who Gives A Shit, which included their hilarious U2 ep cuts, along with everything else they did directly related to that saga. It’s worth checking out if you’re a fan or merely curious.
