Tidgy... looking at other Subarus? Say it ain't so!!
I think it's worth a look, if it's local... just have a really good look through all the receipts and underneath etc. If he doesn't have any receipts or proof, assume it hasn't been done.
Also might be worth finding out who did the 2 door conversion then researching them to see if there are any horror stories, that lovely paint job may be hiding some horrors.