I know we did some trading & selling to each 
other back then - but don't remember if any 
didn't have sketches.  Also, a lot of fellow 
collectors of that time are out of the hobby now -
 so who knows if they still have those cels or if 
someone else does.  

Guess could try just scanning in the art part of 
sketch and ask people to email in their sequence 
number to see if find match.  I know if found a 
match for a cel of mine wouldn't get too bent out 
of shape as long as just had to pay postage to 
get it.