I used some precut cardboard mailing boxes for boxing rolls which have
lost their original box.  Specifically, the boxes from Paper Mart did
the trick (stock #08510, 2 x 2 x 12-1/4 inches, sold in bales of 50).
I see they are currently out of stock, but that shouldn't last long.

http://www.papermart.com/five-panel-folding-tube-boxes/id=1202?SearchItemNumber=08510 

Marshall Jose