A suggestion if looks are not a big concern: why not get a clear Tupperware container instead of a project box? Alternatively, just cut a hole in the project box and mount a small piece of plexiglass and use silicone caulk to seal it to the box. Depending on the thickness of your box and how much the buttons stick out you may want to use some double sided tape and some pieces of whatever to extend the buttons so they poke out of the tape, which would make them easy to press versus having them set back into the box.
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