Bob, the 2 black square things are indeed caseless ammunition, and they most likely come from Heckler & Koch.
Alan, some have been identified, but I'm on the road at the moment. The big cartridge is an old Fiocchi 12 guage slug. The cartridge on the left is a proof round from the US, purple bottom and bullet. The paper cartridge on the right is a French Chassepot Model 1866 version.
No idea what the larger paper cartridges are (yet).
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