That'll buff right out after a simple paintless dent repair. /JK
Glad it wasn't more serious... IMO, body-only damage isn't as worrisome for selling a used car when you are done with it.
Someone earlier said "document the hell out of it"... I'd agree with that... If I'm selling that to someone, I'd show them the photos and give them the story. If they object, there's plenty of buyers for a well maintained truck that had a simple body repair done professionally.