The tally sheet is a must for a central checkout for multiple sellers. Try really hard to enter everything. Several times when we had a multi-family yard sale, there was always extra money in the box when we divided up the cash. (aside from the starting cash box amount). The only fair thing to do was divide it proportionally between the sellers on who had the most stuff sold on the tally sheet on down. Unless you sold everything of yours and you know you have all your cash.
It's annoying to try and figure out who an extra $30 goes to after everything else is added up.