Probably rotted away and the owner still thinks they are worth a crap ton.
If the chassis has rot on it (look throughout the chassis) then you are talking about a full chassis replacement. If the chassis needs to be replaced, you are probably looking at a full rebuild of all the major systems. The interior is most likely trashed and even spartan, pieces are pricey.
Sounds like these would be good donors or parts trucks. Sorry to be a pessimist but I've seen too many "oh its been sitting but its fine" trucks that turn out to be huge basket cases. More common than the latter.
Right now a vehicle that had a title, but was rotted away...I'd probably pay $800. Maybe $1000 for a 109. No title, a lot less since its more work than its worth.