Originally Posted by G$
Thinking out loud here, but the later the category(eg brisket), the harder it is to avoid a duplication.
The more tables a contest has, the easier it is to make sure a team does not hit the same table more than once. Think about it, if a contest has 13 tables, only 3 of those had that team's 3 prior turn-ins (less than 25%). If there were only 4 tables, 75% would have had a team's 3 prior meats.
I also believe table captains are given sheets to mark off and check to make sure they don't get the same boxes twice. Maybe that only happens with certain KCBS reps, I'm not sure.