Retro Cartridge Pendrive

This is a shell for a Toshiba 8/16GB Pendrive in the shape of an old GameBoy(ish) cartridge.
It was designed as a gift for the participants in the 2016 videogame coding marathon DonostiTron (ES, EU):
http://www.donostitron.com/

Pendrive is one like this one:
https://www.amazon.com/Toshiba-Transmemory-Hayabusa-Flash-Drive/dp/B0073YRWMK/ref=sr_1_6?ie=UTF8&qid=1479288757&sr=8-6&keywords=toshiba+pendrive+8GB
But there are 16 and 32GB models that look the same, so they might fit.

The FreeCA