I am sure you have already solved it or moved on but johnd393's comment at
https://www.fixya.com/support/t1766897-disassemble_mailmate_spl_727mm helped me.
To reach the screws in the tray drill 6 holes in the bottom plastic and use a really long screwdriver to access them.
I used a 12 inch uxcell #1 Phillips screwdriver, which also worked on the 2 long screw holes hidden under the feet. You could probably get away with 10 inch or a #2 Phillips but with #2 screwdrivers check the width of the shaft first as the screw holes under the feet were too small for the #2 I originally bought.
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