I agree with both of what you said above Yann.  
After everything is said and done on a suspicious 
cel you've just gotta trust your instincts.  No 
one is the guru of cels and knows all ^^'!  But 
checking against a screencap is a place to start, 
and gathering opinions here is another good route 
to go.

Yeah...I didn't like those..."O!  Look at this 
cel!" Y!J auction posts.  And when people try to 
post questions about an aution here that distaste 
seems to be steming over from those previous 
posts^^'.  People do want as little competition 
as possible, but, really...Even if you think you 
found a secret auction...There's always gonna be 
someone else who's seen it...And...most of the 
time they won't bid on it...And if they 
do...That's just the way the game is played on 
auctions peeps...Highest Bid wins.