Depending on the type of mail it is possible that the tracking does not work on international packages. The USPS requires priority or above for tracking to work.
Yes, this is possible.
My problem is that I can't contact USPS to ask them to check this tracking number and see if they know where is the package...
I could phone, but that's going to be expensive.
I don't think anyone at USPS will be able to help you.
Have you emailed Mike B. directly? (mike@avalanchepress.com)
Did he respond?
I've been ordering American stuff from across the Pacific for 8 years... sometimes things just don't make it. Fortunately, the merchants have always shipped a new set out of the goodness of their capitalist hearts.
...came for the cardboard, stayed for the camaraderie...