Your wait is because all international packages have to pass through customs.

No one but the US government has control over how long that takes - and it can vary from day to day.

Generally, seed shipments go through the normal postal system rather than UPS or FedEx.

I realize that didn't answer your question, but thought I would throw it out there in case you hadn't thought about customs.

Nirvana has an excellent reputation. I'd be very surprised if they don't replace your seeds if they go missing in transit.