New challenge!!!! shell casing type???

Ok folks, I have a challenge for you. What is this shell casing? A Friend of mine gave them to me. He got them (about 150) from his grandfather

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GBA Nintendo Game Boy Advance Pastel Green Replacement Shell for

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What are your opinions on fake faceplates like this? : r/3DS

Game Card Case for Nintendo Switch Games, Hard Shell Protective and Durable 24 Slots Card & 24 Slots Micro SD Card Storage Holder Box

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New 2ds Xl Replacement Shell, Shell Cover New 2ds Xl

Classic Limited Edition Replacement Case Theme Style Shell With Buttons For Handheld GBA SP Shell Case SP Game Console From Botuo68, $7.32

Limited Run Games - The Streets of Rage 4 Classic Edition includes the game in the standard case, a SteelBook case, and a large Genesis clamshell that will fit both cases inside!

New Colored Deck Shells — Dragon Shield - PHD Games