Adafruit Powerboost 1000C large holes next to the mini USB port?

Does anyone know what the large holes on the side of the charging port are for?

Thanks.

hello, looking at mine I would say just mounting screw holes to secure it to something ,depending on how u use it ,I just have velcroed to the phat stack board im using

I think they are for screws too, but wanted to check just in case.

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