dues a new packaged of bees? I have seen mites in the hive boxes and screened bottom tray.
Live mites? With no live bees? Doubtful. Clean it out well and call it good. If it makes you feel better you can paint it with some mineral oil and wipe it out or fog it. It won't help with mites that I believe are already dead, but it will keep the bees from connecting things so much and may do a miniscule amout of good on any mites on the new bees. Of course you may as well just fog the new bees after they get settled in.