I am a bit confused???
You said that you made an insurance claim for a new engine??? Then your old engine would actually be your insurance carriers property now for them to attempt to salvage and recoup some of their $$$ expenditure.... BUT, if it was an insurance claim my bet would be that the insurance company would choose to just repair your old engine and not buy you a new engine seeing that repair would be less costly then a new purchase. After all, insurance companies are for profit corporations who like to make $$$ by minimizing expenditures (claims)
Hence my confusion???