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Oh, it's too tight around the pins, not the external casing.
A small drill twisted by hand should do what you need and since they were refunded you're not voiding any warranty.
That or a very small soldering iron tip gently poked into the holes to open them up a little, just don't breath the fumes in.
Funny to say that about fumes, identifying plastics relies on an ignition source, smell, taste, flame colour and whether or not it self extinguishes (there's also flotation and a couple of other things but primarily smell and/or taste).
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