Hello, I have shipped a bag I sold on eBay to United Kingdom via USPS Priority International Mail. I was told there isn't a tracking number because UK doesn't work with USPS to provide tracking. But there is a custom form number... that is CP########US. I shipped out on May 18th and the buyer already filled a Paypal dispute on this item because there is no update on the USPS after it been shipped out from Chicago Airport. I called USPS 800 number and they said it is currently in UK custom and will have an update once the item clear custom. But with my experience, the USPS website never update the status with custom information... am I right? For these of you who have shipped priority to UK from US, please give me some help on this... This is the first time I ship international and I already have a negative balance in my Paypal account. And of course, USPS wont' start a trace for me since they believe its in Custom and I can't file a claim until next week. Thank you!!!