I'm absolutely 110% positive.

Check this one out, this is a Hero Collection 3 
card. It usually has a black border on the top 
and bottom that has been "cut off". You can tell 
from the image the little "dots" that you usually 
get when you scan a trading card (because trading 
cards are usually printed with a series of little 
dots to make it look to the eye like a solid 
image). A cel comes out VERY clear because it's 
actually painted. If this was a real cel, those 
dots would not appear.

http://cgi.ebay.com/aw-cgi/eBayISAPI.dll?
ViewItem&item=569958865

Now, here's a scan of the CARD this was "cropped" 
from:

http://lynx.dac.neu.edu/a/amokhtar/pictures/dbzsca
ns/bdbz4.JPG

Even if you don't believe me ^_^; you could 
always try writing the seller and saying "does 
this cel have a douga?" or "what are the cel 
numberings on this cel?"  He probably won't 
answer, will lie, or won't have a freaking clue.

Almost every single image up there that has 
been "cropped" to look like a cel is actually a 
Hero Collection 3 card.

http://cgi.ebay.com/aw-cgi/eBayISAPI.dll?
ViewItem&item=569958869

These are just obviously repros.

take care,
misa