This is about eBay's International Standard Delivery option, not the Global Shipping Program, right?
Somebody posted this on another discussion, "If you actually check your ESUS status on for example the DHL link it will give you ALSO the USPS tracking number"
So track the package on DHL and apparently that will give you the USPS part of the number.
You can also track the package here: http://parcelsapp.com/en/carriers/easyship
What kind of issue are you having and is it during the US or the international part of the journey?
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