If you’re sending a parcel or awaiting a delivery, it is always important to check on your delivery status every now and then to make sure everything is okay. If you ever suspect that USPS lost package that belongs to you, visit USPS website and follow the procedures described there to initiate investigation and retrieve your parcel as soon as possible. And in rare case when your parcel cannot be found by the carrier, you can file a complaint to get reimbursement.