Are you in the USA? UPS collaborates with the USPS. I don't know who does what, but it appears that when packages pass between them, they lose track of it. I've

Are you in the USA? UPS collaborates with the USPS. I don't know who does what, but it appears that when packages pass between them, they lose track of it. I've had this happen a couple times during holiday season. I tracked an UPS package from the sender, it became "lost" for a week, then UPS suddenly located it and delivered. I've talked to guys at the local post office and their warehouse is a black box during the holidays, things go in and it's a mystery when they will come out.