My boyfriend used this the other week on something he brought from ebay as a valentines day present for me & was sending it to me (they wouldnt send to sweden still find that odd
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It worked fine took about 11 days to get to me I think.
I just asked him about this and how it worked he said ...."its a ebay thing, you can see the tracking on the order you made on ebay" so have a look on that should show you whats going on, shouldnt have to enter the number
I would say with any tracking always give it 24hrs before you go and search the number as its got to process.
Also just a note I am wondering why the postage is so much as you don't need to pay customs on something that is $13 as our limit before custom charges is £15 ($24). I know my boyfriend payed a lot for postage (wouldn't tell me exact lol) but it shouldnt be that much as you do not need to pay customs.