DG - I sell quite a bit overseas and the only time I had a problem was with postage going to the US during last December when the USPS couldn't cope with the volume of parcels going into the country.

Usually on the USPS and Canada Post tracking sites the number on the green customs declaration form is trackable which helps if there is a Paypal claim.

For parcels which weigh over 2kg the blue customs provides proof of posting and is trackable on both those sites.

Generally the International Buyers are reasonable to deal with but the US buyers can be the most difficult of all as they have a tendency not to read descriptions and seem to think that everyone should list to suit them ie list in inches and not in cms. From my experience they are not very good at contacting sellers if there is a problem but with the new changes with the US buyer protection policy I think that is going to help sellers.

I also find that there are lot more non payers from International sales particularly from the US Buyers.