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I believe, but am not certain, that you may have a box of older, what is loosely referred to as 1/4 turn OR cam lock fasteners. If you google those two terms you will find what appears to be more modern versions of what you have. I have seen and used similar fasteners like you have on surplus military equipment, they were quarter turn cam locks used on access panels on equipment that was used in the Air Force. But none of them had the cam come out the latch like yours does; they remained in the access panel. They did not look like yours, but worked the same way, spring loaded and 1/4 turn open the door. Yours kind of throws me. Why does it come apart? Almost like a key. They usually do not do that cause the key will get lost... so? Not much help. Sorry.