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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Gamegenic - Game Shell 250+ – BoardGameGeek Store

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Red Gyarados Style Housing Shell Case Kit For Nintendo Game Boy Color - Orange | UV printed by Jamesyplays | ZedLabz

Game Boy Pocket Replacement Shell, RetroSix

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UV printed design by Jamesyplays - Jigglypuff style housing shell case kit for Nintendo Game Boy Color - Silver| ZedLabz

Mobile Controller New Silver Plastic Full Housing Shell Case

KUIDAMOS Game Console Cartridge Shell for NES,60Pin to 72Pin Game Cartridge Case Dust Cover Card Cartridge Box Replacement Protective Game Card Case Games Cartridge Holder (Red) - Yahoo Shopping

Shell Shock hybrid Al/Steel casecutaway [autogun 7121.144]

NEW] Ultimate Gun Shell SFX Pack Released