Tim drove out from San Diego yesterday. I met him at the hotel/resort they were staying at and he followed me out to the property. Super nice guy!
He's also a cyclist so we got to talk about bikes (the pedaling kind) while we went through all the parts together.
Walked away with $800 rather than the original $1300 offer. I don't think he found everything he was looking for, and what he did find was a bit beat up (to his expert eyes) but still... he drove off with a good, complete r69s engine, a couple final drives, some old r69s jugs, 5 original carbs, a worthless frame but great rear wheel and a bunch of smaller stuff.
So we (or rather the Estate) is a tiny bit richer

and have less stuff. Money goes into the Estate account to pay off Estate bills...
Thanks all for your advice...