It would need to be an H Type vac and you would need to be trained to level/Cat B working with asbestos.without seeing the box's we cannot say for sure,
but YES ! many of the older box's had asbestos in them.
It's usually safe to work on them, but if your drilling holes ?
then use a vacuum to suck up the dust.
Whilst it just requires a little comon sense
your not gunna fall down dead at the first touch of asbestos.
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