I opted out of Ebay's GSP over 2 years ago (buyers complained about cost
and long shipping times) I've been printing Ebay international/customs
labels directly. Much faster and less expensive to buyers. (note: not
all countries are supported)
Yes, you need to go to USPS.com and file a missing mail search (you may
need to register a free USPS account). Provide tracking#, Buyer's
name/adress, description of item, etc. If you shipped Priority mail then
you may havesome insurance coverage if ...