They are listed at the end of the computer vended postage section in the U.S. Specialized. They were from a kiosk ("postal buddy") that was tested in Virginia at the time to print and vend various forms.
Coincidentally (?) a whole bunch of these just showed up today on the Hip Stamp APS store (unused, in sheets of 4). I have not seen these before and now they are turning up everywhere. :-) Sort by Recently Listed, or https://www.hipstamp.com/listing/un...ux1/55285695
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