They tried this with my dad when he sold his 8n on CL. He was 75ish. I told him not to even talk to anyone or deal with anyone that will not come and look at it.
He still calls me telling this BS story about the guy wants to send him a check, said he wants it and sending a check. I said, its a scam dad, "what how could it be a scam he wants to send a check", its a scam dad! He listened, it sold to a real buyer a week later.
My theory, they like tractors because they think everyone with a tractor is a gullible farmer who trusts everyone. Apparently they are right in some cases.
As soon as you see the words "I've been really busy and cannot come to look", it is a scam.