iPod 1G replacement - sending to PMB Box?

I don't live in US, but I've bought there one of the 1st gen iPod eliagible for the Apple's replamecement program.

I do have a forwarding shipping agent in America, who gives me a PMB box as address.

It's written that they can't send to P.O. Boxes, but it doesn't mention anthing about PMB boxes.

How can I be sure now?

Thanks