Google Alerts was the key.

Set up alerts for Craigslist, eBay and everything else you can think of.
Use the " keyword" search parameter.
Look for every keyword you can think of. "Roleiflex, "Camera" or what have you.

eBay will send an e-mail link to your gmail account whenever there is a hit.

I got a hit off "Gossen".

I asked the cop if he would let me watch him put the handcuffs on the guy. He laughed and thought it was funny.

BTW: Yeah, they clean out estates, alright!