When the package arrives, check it against the listing before you confirm anything. Confirm receipt in the market only when the item is physically in your hands and matches what you ordered.
There is no rush to confirm. Take the time to check the item first. Confirming is your signature on the escrow release, so it is the one action you cannot take back, and it should follow the package rather than precede it.
If everything matches, confirm and the escrow releases to the vendor. If it does not, do not confirm, and open a dispute.