Tamper-Resistant OTP Container

I made these for the tutorial I'm working on regarding generating one time pads with the Adafruit Internet of Things Thermal Printer. You input the serial number of your one time pads into the SCAD, generate an STL, print the plate to nearly the top of the container, pause the print, drop in your printed one time pads, and then complete the print to seal them in. When it's time to use them, break open the container (you'll know which one by the serial number embossed on the outside) and use th