I see no problems with having a fender tag made from an original Build sheet as long as the sheet goes with the car and from what I read it's easy to tell the difference between a real sheet and a fake one. I personally could care less about #'s but understand that it adds value so greed is involved. But I don't understand how aftermarket chinese stuff and parts from donor cars don't ruin a cars value with that line of thinking...The purists make up the rules as they go along kinda like religion...Some of these guys are the same guys pimping "fake" radiators,distributor tags,torque boxes and such...
It's ok that way to make a car appear with parts that really are not what they seem to be...