A last minute idea : inserts compatible with my deckboxES !
From now on, I'll use the 82×96×76mm interior volume as a standard for my deckboxes. Meaning that I can also create inserts to expand their utilization !

Compatible deckboxes at the end of the description

Here 3 ready to print example :

• Memory cards with 12 microSD slots and 16 SD slots + a big slot to stuff paper pieces and notes to write what's on each cards
• Switch games with 28 slots
• NDS and 3DS games with 16 slots
• A blank one for you to edit (GC memory cards, batteries, proposal ring, whatever you want)

I've made a profile with them printing upside-down to get advantage of textured bed, but any orientation should be okay.

Compatible deckboxes :
https://makerworld.com/en/models/397942#profileId-299417

https://makerworld.com/en/models/389219#profileId-290180