to REMOVE ALL OF THEIR SOLD cels, especially if  
they were sold months ago?

I can start and this is not to bash the dealer 
for being a bad dealer. But after 6 plus months 
of seeing the same SOLD cels (which often times 
exceeds the available cels), IMO it is senseless. 
Clean up your site. If they have no inventory for 
that series, just say so, IMO no one will think 
less of them. Just my two cents.

Nichibei
Mandarake
Splashpage
Usagis
AnimeIsland