I once had a nissure where something I mailed out failed to make it to its destination because the idiot postal worker insisted I had the wrong zip code (which I'd used multiple times with no issues) and changed it- to one that was wrong. It finally made it back to me six weeks after I mailed it and it NEVER LEFT DALLAS. Even though it's apriority mail box, the USPS doesn't think it's a priority to get it back to you if there's a problem.
Unfortunately, Spartan is correct. We are playing the waiting game now. If you get the chance, Irish, contact your local postmaster and tell them you are looking for the box.
If the box don't make it back by mid September, we may want to consider creating a new one. This is why it's very important that anyone who requests being on the list have the stability and finances to be able to receive the box and to send it on. The usps is unreliable enough without any help from us.