We never talk about grail tapes but after 50 years some cool ones are popping up, either brand new or from years ago. I would have loved to have grabbed an AC/DC tape from record day but unfortunately missed out. Here's an NPR Article from a few years ago about "The Purple Tape" from 1996 https://www.npr.org/sections/therecord/2012/09/19/161403938/the-purple-tape-only-built-4-collectors
I recently found one of my grail tapes.. ( MOB RULES) new in the wrap. I am still looking for an unopened Bowie ( lets dance). The search continues