Thanks for posting! Sadly, I did not come across any plate files for these boards.
With the MK870, we know that such files must exist. There are aftermarket plates [PC, POM, and metal!] that can be found on-line.
Some of them are of inadequate construction [many of the PC plates], so it would be better to have plate files. Because I could not find plate files, I resorted to buying a POM plate for an MK870 last year.