> BUT...On the other end of that comment...there 
> are cels that are used in the actual production 
> of a series, and then used for other products, 
> like video jackets, poster, art books, etc.

Yes, but those cels aren't hanken (else, half the 
cels around would be : Film comics contains a lot 
of pictures from anime :).

It could simply be one of those official 
reproduction cel like the other one displayed on 
that page...

Cheers,
Y.S.