[80schevyaddict]

I know you are pretty sure it isn't a stolen truck. But if someone is ever unsure, you can check it for free here: https://www.nicb.org/theft_and_fraud_awareness/vincheck

Had a '76 Chevy with the same problem. It was a military truck and the decal in the door was missing (likely peeled off after the truck was repainted for the 20th time). Luckily we found some original paperwork hidden in the truck which confirmed the vin (was military paperwork from its last posting) that we were given with it.