Ebay/paypal need proof of shipping by an acceptable shipping method.....sea mail is not an acceptable shipping method.  It is too slow to comply with dispute time frames.   The fact that shipping can be proved is immaterial if an acceptable service is not used.

As usual buyer complains about postage being to expensive, they forget that item can be quite weighty, they want cheap postage so they request sea mail, then complain it takes to long, and get their  money back. I will not sell over seas anymore 

Yes, the very thing, the very ideal for that led Ebay to be popular in the first place,

cheap sales for (or rather bargain hunters), ie sales that are not in bricks n mortar.

is now driving the issues

as

want cheap products but with conditions of high class malls

want cheap freight but if slow complain

and as a result

can claim for ANY reason against the sale.

With ebay automatically siding with the buyer.