I got one that was odd, but different than that.
Had a Aero Precision lower come in for transfer. Called the buyer several times and left voicemails. Never heard anything. So I ended up calling every three months or so until the phone came back as disconnected.
Just left it on the book and never did decide what to do with it.
Got a call from ATF after about three years doing a trace on a lost/stolen gun and it was that lower! I had it sitting right there and explained that I never got a response from the buyer.
Vendor ended up getting me a RMA and I sent it back to them.