What to do when the Magnetic bit on the Kick75 is Lost??

So... It's gone... Despite my best efforts, my kids love using my keyboard as well, and somehow (not naming names...) the little magnetic cover that says 75% is now gone. Lost to the crevices of the couch, possibly the A/C vent, or in God knows where. 😭

I haven't seen the printable file for this little piece, nor a replacement to purchase. Any ideas what my recourse is??

Damn Kids...