I'm guessing I was one of those but the postage I used (I thought) wasn't metered.

It was purchased on those stupid new do-it-all machines they're putting in the lobby of every post office around here.

I looked at the stamp and didn't see a date buried in it and no message was given on the machine that the stamp had to be used within a certain time.

That's what I got from the machine when I told it I wanted to buy Priority Mail postage (and it didn't ask from where to where or when).

Next time, I'll buy normal stamps from it and include eleven 39cent stamps covers it...

I can mail you stamps if you'd like to reimburse for the most recent swaps if mine was one of the problem postages.

Thanks!