I didn't know if he was a crook or not. But he sure acted suspicious. When a new guy pops in from nowhere and doesn't tell us who he is, or anything about himself and he wants to make an offer to you in private - that's suspicious in my view. And he left us a very unusual email address.
I didn't want to disrupt a sale for you, but I felt I owed it to you to caution you about it. Then after I did that, he sent me a PM giving me a bunch of crap. To heck with that
, I banned his ass.