Funny story about diminished value: A few years ago a UPS driver hit the back of my truck at like 5mph. I got it repaired at ford and informed UPS Ins Co that i'd also be filing a diminished value claim. The plan was to go to a few dealerships and get quotes based on pre-accident and post-accident. Before I had a chance to do all that, they offered me something like $972 in diminished value. I said, "nope."
So sometime between my denying their offer and me being able to go get quotes, a check shows up at my house for like $2300. To which I say, "yep! I'm taking that." So I go cash that check. A week or 2 later I get a letter explaining that the check was sent by mistake, and I needed to return the funds less the $972 they had offered. Into the trash that letter goes. You sent the check to me. My cashing of the check was my agreement to those terms. EAD.
I get a follow up letter a few weeks later with the same demand but also including a sideways threat about having to go the legal route if necessary. Again...EAD. You sent me the check. I didn't defraud you. Into the trash the letter goes.
Then I get a letter from a lawyer, basically making the same demands with some implied threats. Suck my D, Suck my D, why don't you go and put my DDDDD in your mouth. Into the trash it goes.
Got a few more letters over the coming weeks from the same lawyer/firm, all of which I just ignored because I hadn't done anything wrong and there was nothing they could do. If it was a mistake, it was their mistake, not mine. $2300 was fair imo. Eventually the letters stopped coming. Never heard a thing about it again.