eBay

The item is coming from China. 5 days ago the tracking said it had arrived at the Chicago International Distribution Center. My question is... Once the item arrives in the US does it then assume a new tracking number through the USPS? I'm just wonder...

I ordered a package from China and the seller marked it as shipped. The tracking they provided is WCFF017061618658. I've never seen a tracking number like this and can't find anything about it online. What kind of tracking is this? Is it legit? Thank...