Auction Arms has 2 empty shells for sale for $6.00 plus shipping, I copied part of for you. (See below)

Yours which appear to be virgin with the box should get someone's attention.

Seller's Description:
Marked on case head: 12 ALCAN INCORPORATED 12 MADE IN USA. The main part of the case is Aluminum, the base is either brass or copper. Stumbled across them at a gun show. Nice condition, just a little tarnish to the base. I'm not sure if they've ever been loaded, they are currently empty, no primer.

http://www.auctionarms.com/search/displayitem.cfm?itemnum=8418483

Postage for the two cases will be $2.75. Thanks for your bid and be sure to check out my other auctions.



"Somehow, the sound of a shotgun tends to cheer one up" -- Robert Ruark