USPS International does cover follow up until the buyer has it in his or her hands; you have to ask for a sing thought.
This is the way I have got 60% of my collection.
If you really dont trust him or her ask for a wire transfer it will cost around 5 or 7 Euros depending on his/her bank (exchange for today is 0.669672)
I will advice to take all precautions if you dont feel safe. Seller and buyer have to be cool with this kind of things.
Just one thing: that you cant find him on the internet by Google him/her or he just became a member of the forum does not mean that he is not to trust.
I being reading and following this forum since Im a kid and just became part of it couple of days ago. That does not mean that sellers like Arizona Custom Knives, Steel Addiction Custom Knives, Monkey Depot, Nordic Knives, True North Knives, TAD Gear, Blade Art Inc. and some others in Austria and Germany wont trust me, get what I'm saying?
I have even sent some feed back to sellers as how different countries Customs treat their people.
Some story:
For example in north Germany they send you a letter to your house and tell you to go by the Customs office, there, you sit down and wait until the girl in front of you is finish opening the box she just got from Abercrombie.
Here come the good part: your turn, get up, give your letter to the guy and he makes you wait for some more time until he gets the big package, then he ask you whats inside, you say its a camping tool he looks at you and say o really, please open it you open it and look at his eyes when he sees a 17 knife coming out of it and he say a camping tool, uhu yea
Then he asks for all the payment information; invoices and all, you give the PayPal invoice, your credit card extract, passport and permit of residence.
Here I have to say what you pay for the knife, $656.00 including shipping.
So Customs guy takes the package from you and makes you wait a bit more. He comes back and say ok I have to charge you 19% of the total for tax, and because its more than $250.00 I have to charge an extra 6% for import charges, but this knife does not cost what you are saying, I just got to the internet and saw that this knife cost $800.00 plus shipping, how can you explain that? then I explain that a SE or LE will cost that but this is not a SE or LE.
After one hour and paying all the taxes and feeling like a liar I go home with my baby in hands.
Good luck with your sale and I hope all goes ok.