If you have access to a scanner, scan the offending plastic and make a note of the DPI the scan is done at and upload the file.
I'm sure someone on here, maybe myself will be able to cut you the required plastic.
Then you have two options to finish.
Waterslide decal or transparent sticker. Either method requires printing mirrored and mounting on under side of plastic.
If the image includes white a layer of either white transparent vinyl is applied to the back or a thin layer of paint can be sprayed on.
Another quick bodge is to print onto a white gloss sticker and stick it to the top.
None will look perfect but all look better then a missing plastic.