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i found this on the usps website it does-wonder if it would help PBS swapers?
though i think you would have send the package first class but it does state other uSPS-approved vendor, packages
Currently available for Express Mail only, the popular Hold For Pickup service option will be extended to Priority Mail and First-Class Mail commercial parcels in the new year. Available at no extra charge for customers using shipping labels from Click-N-Ship or other USPS-approved vendor, packages with the Hold For Pickup endorsement are shipped directly to a Post Office, instead of being left at a recipient?s address. Packages are then held at the Post Office until picked up anytime during office hours, at a time convenient for the recipient.