I have received a response from the auction house and they do have some documentation on Banesto letterhead paper that would make your average person believe that it is indeed Indurain's 1995 bike. The problem is that there is no way to actually tie the particular bike to the letter. By this I mean to say that one could easily have a legitimate letter but one has no way to prove that the letter refers to this particular bike because there is no serial number or photographic reference so that one can verify if the letter that appears to be fully authentic was written about this bike.