Because you were looking for Anna and paid less 
attention to cels.

Or because you're a man! LOLOLOLOLOL ^_~

Did you come in the lateral room at the left 
when you enter the exhibit room? I was in that 
room with my cels in a boc on the table.
When you entered the exhibit room the first 
stand on your left (against the wall) had the St 
Seiya and the Escaflowne cels (with  2 cels 
stabbed on the wall) and the last cel dealer was 
at the bottom of the first row turning right 
after the entrance ^_^