DogsNDaylilies said:...users may get upset if I send out boxes before their seeds have arrived. It leaves the host open to criticism for doing it 'too early'.
As the host of the swap you can set your own mini-set of rules within the available program that Dave has provided - you can set the date when your re-packing will begin. Anyone who mails late should know the consequences in advance as it should be part of your rules. As the host you cannot send anything out "early" as the re-packing cannot be done until
all packages have arrived at your home and/or until the set date has arrived.
The Priority mail which includes tracking is the best option for most folks and as we found our during that one Piggy Swap, if the Post Office misplaces the packages they are required to hunt them down and get them to you asap. No postal system is perfect but the USPS is the best option we have.