Gosh, Dennis... that's a happy/sad circumstance!
Don't know what a disassembled TF should be sold for but if I were to run across the same situation I'd be asking them what they consider a fair value. That said, the project is not for the faint-of-heart, either. If you've T series experience it may be a bit less-so. A one man "Hammer-and-Tongs" approach, with no budgetary concerns and proper craftsmanlike practices would be a six month effort, IMO. That's with 8 hour days, five days a week. Based on that it wouldn't be worth a whole lot as-is if the intent is to recoup the "investment". But the TF is the T series I'd own if I went looking for one.
"Nothing missing" could see me offering $1,000~$1,500 with a contact number to call if they decide it's too low now. Very few will offer more in the condition it's in, IMO. Commercially I can see it being on the upwind side of $30K to do that job.
Just my tuppence-worth. Good luck and keep posting!