Hi Kris,
I have been buying seeds from Jan for quite a few years now and have never had a problem with the seeds being delivered, apart from our quarantine dept holding them up sometimes with inspections. Jan always asks that you send no payment until the seeds are delivered to you. As I said previously he is sometimes (almost) always very hard to contact and I know that he is constantly travelling somewhere or other. Maybe you should check with either your postal service or your quarantine service and see if there is a problem.
Regards, John.