Welp, the story keeps getting better and better. About 30 mins after I sent the email with the pictures I got a phone call from another family member - also a grandchild of the original owner - and they want the truck back at any cost. Turns out the whole family is a bunch of motorheads and they all have vintage hotrods and trucks, etc. This truck has been lost to the family for over a generation and the entire time it probably wasn't more than 25 miles away. It was just hidden out of sight in a back pasture field somwhere. "Grandpa" died about 15 years ago and the whole family has always wondered whatever happened to this truck. I'll be making arrangements this week to transfer it back to the rightful owners. They are all beside themselves over this development.