I took the South position at table 6, as usual, to give myself the job of finding and moving the boards.
All went well until we came to play boards 16-20 against team 3. We played 19 and 20, while table 3 played 16-18. I took our played boards to their table and collected their two played boards. It was only after we had finished bidding the first of these that I realised it was board 15 from the previous round, which hadn't been moved on.
How do I sort this out?