Possible new scam
Foreign buyer send PayPal for small order. Not enough money to justify registered mail. They then claim they never received items. PayPal then asks the seller to furnish tracking number which does not exist for foreign mail. The buyer receives their money back and keeps material.
Comments
I think you can track it as far as the last point before it leaves the US. I have put customs label numbers in the USPS Tracking search box and it has worked for me.
Buyer and seller, negative's and positives, end of story
Sam