I talked with my postmaster at the PO today. I was told that Customs can open any package coming into the country, or going out of the country.
With the bird flu frenzy, anything with feathers might be being held, or possilbly other things that we may not want ot think about..
I am going to try to find out something from the US Customs Service about this.
It could screw up doing swaps across borders.

Rick