IKEA Drona Kallax Label 30mm by - 50mm wide - Insert version
Cut out slot, to slot your label/paper into the holder.
Fits nicely onto your box. 1 x option, 4 x option or 8 x option added to build plate
I have included a PDF document for the layout if you wish to print out the inserts.
Check out my other sizes on my profile
12mm option - https://makerworld.com/en/models/127517
30x50mm option. - https://makerworld.com/en/models/130218