Mark dropped a brood box, and is now wondering whether or not he wiped out
his queen in the process.

I recommend waiting a week or so, then taking a look inside the colony for
eggs or queen cells.  If you find eggs, then the queen is still there and has
gone back to work.  This is the more likely scenario.

If you find emergency queen cells, then your original queen is probably gone
and you should order a new queen.

W. G. Miller
Gaithersburg, MD