Is my order stuck in USPS? or has it actually been shipped?

Okay, I ordered a game on Tuesday on Amazon(from seller). The track on Amazon has had "Shipment has left seller facility and is in transit", but no location and has had that same message since Wednesday. I went on the USPS site and it said that the Electronic Info was received. Has the seller even shipped my package yet, or does USPS just not update?