Heyyy. :) The boxes are actually from numbers 1-10. Oops, I guess it does look like the no. of participants is the number of the box. *facepalm*
You can actually grab any box from 1-10 even if someone else has claimed it. :D
And don't worry, if anything too troublesome comes up in life, we can always just drop the round and come back another time. XD