I love threads like this! The sharing of stories and successful treasure hunts!
This may not be my biggest windfall dollar-wise from Ebay but it is worth telling.
In 2011, I was looking for decent ASM1 GRR record to go along with the GRR comic I already owned. I found an opened one of good quality listed on Ebay and bought it. When I received it, I took out the record and inspected it. It was in good condition. I then looked closer inside the jacket and pulled out a ASM 1 GRR comic. I think it turned out to be about a 8.0, nothing near-mint.
What a surprise!
I kept it