One of the large cels I have was shipped rolled 
and did come through all right except that it 
took a LONG time to get it to lay flat again. 9_9;
(I didn't know the seller was going to ship it 
like this. . . ~_~;;)

For the second one, the seller shipped it to me 
using about 10 or so of the largest priority mail 
boxes -- all of them left flattened, then taped 
together to make two *huge* flat pieces of 
cardboard. The cel was sandwiched inbetween. This 
took just short of an hour and a half to get back 
open (*sweatdrop*), but the cel was perfectly 
fine. ^_^  The downside is that it probably took 
a whole roll of Priority mail tape to put it 
together -- the upside is that the Priority mail 
tape is free when you ship Priority. ^_~~

In case you're curious, the rolled one was 
shipped from Japan. The other was a domestic US 
package.

Many Sharp Smiles,
--Drac