Lambchop,
When we know we have multiple swaps, we make sure there is different along with old or past seed offerings. Before any of the swaps started, I divided my seeds from this year, traded seeds that need new homes, and past swap offerings. I actually divided into 4 swaps just in case an extra swap popped up. If it doesn't happen, what is left all goes into vials Feb swap. This way, I have variety offered.