Some vintage Eddie Vedder has recently surfaced on YouTube. Check out this demo of Plenty of Time. If it gets enough views, maybe Eddie will revisit it during his Southern Tour.
I purchased this demo tape off of ebay 12 years ago. There was limited information from the seller, other than that he purchased it at a yard sale in Montana. One side of the cassette contains three tracks I cannot identify as Bad Radio Songs. The fourth track is the acoustic version of Homeless. The other side of the cassette contains 4 recognized Bad Radio Songs.
The cassette holder is visible in the video. There is writing in white-out on the cassette, which labels one side "Bad Radio", and the other side "The Butts". A written note inside the cassette says "this is the butts first demo. must see live. keep in touch. eddie (phone #)"
If these three tracks are indeed The Butts and not Bad Radio, then I believe it will be the earliest known recordings from Eddie Vedder.
