These Thundercats cels looks like a bunch of 
those reproduction cels that were being sold buy 
a guy an England about a year or so ago. His name 
was Ben Richards.They were all from early 
episodes and none of them had backgrounds and 
most came with the matching sketches which were 
used to make them. He had gotten all of them from 
a dealer in Korea or somewhere. But they were 
proven by a Cel gallery to be reproductions. This 
guy had been selling them as originals.
 Best way to tell if there fake is to compare the 
cel with the actual scene its from. If theres 
quite a few subtle differences such as colors 
being off and the black outlines looking a bit 
off and etc.,. then you got yourself a fake.
 No offense but i'd recommend trying to find out 
for sure before spending money on these.