SID: us_coretrails
URL: https://www.coretrails.com/home/[TRACKNO]
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The package was delivered, and the Coretrails tracking info was updated to show it within a couple of hours. It showed an accurate delivery time.
I'd say that Coretrails is not "fake," and the person who reported that it is was confused. And here's part of what may have confused them: in my case, though I made the purchase on eBay, with no returns accepted, the delivery was made by Amazon, and the product was in a regular Amazon envelope and included an Amazon gift receipt, which means it is returnable.
Coretrails seems to be a shipping "front-end" that lets you track Amazon deliveries made through their service, if that makes sense.