ebay global shipping tracking

bought an item from the us on 29 july, seller sent the 31st under ebays tracked global shipping. i have the tracking but every time i check on the pitney bowes website, it just shows as sent but still hasnt reached ebays shipping warehouse yet. could it just be a webpage glitch? dont want to hassle the seller after two weeks.
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Could be held up in Customs somewhere?  If the Item hasn't turned up by one day after the Estimated Delivery Date open an Item Not Received Case in the Resolution Centre.