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

New Style Multifunction Case Hard Shell Travel Carrying Protective Storage Bag for Nintendo Switch Red/Blue/Gray/Black

RDS Switch Lite Deluxe Travel Case – Mario Grey Deboss Design, Nintendo Hard Shell Protection Cover Organizer with Game Card Holder Slots, Micro SD Card Holder Slot

The Title Game — Making Predictions (Year 1)

Shell Casing

Pensaar Design: A Design Strategy & Innovation Consulting Firm-DT Examples

100% Brand New and Quality Assurance. Color:Limited Edition Gold.As the picture show. This repair part is only compatible with New 3DS XL / New 3DS LL

New Replacement Front Back Faceplate Plates Upper & Lower Panel Battery Housing Shell Case Cover for New 3DS XL 2015 Game Console - Limited Edition

Label:Yes, Quantity: 1 set, Weight: approximately 80g, Packaging size: (13 * 15cm) 5.1 * 5.9 inches, Color: Transparent, Material: Plastic, Packaging

Split Type Game Console Shell Plastic Game Console Cover for Nintendo New 3DS LL/XL Games Console

My first project, IPS screen, type c charger and new shell. : r

Tired of your boring old standard color?This is the way to go!Great customization option for DIY enthusiasts with a handheld console for Nintendo DS

eXtremeRate Replacement Full Housing Shell & Buttons with Screen Lens for Nintendo DS Lite NDSL - Monster Index Console Style

ICv2: Help Turtles Find Love in 'Shell Company: Don't Write Me Off