Folks I could use your help with identifying a paper cartridge. Last year we bought a Riker box at auction with 3 cartridges and a bunch of recovered items. The auction house we bought it from was kind enough to throw it in a box and ship with no packing. Both the paper cartridge and the linen cartridge were destroyed. The one paper cartridge is the one that we are questioning. It is 50 caliber but the bottom inside of the bullet we have never seen. 1st off we see the glint of brass in the bottom of the cartridge. Also the bottom of the cartridge appears to have a plug in the center. We are uploading 3 pictures. The Riker box is how it looked at the auction before the box was shipped. The cartridge we are questioning is the light cartridge that is in the 2nd row from the bottom and is the 2nd one on the right. Any assistance you fine folks could provide us would be greatly appreciated.