> What would likely happen is the system would detect the stamp was already
> used, and kick it back to the sender with "Insufficient Postage"
> emblazoned across the stamp.
I wonder if they even bother to check them against a database of already
used/issued ones? Maybe they just check the checksum?
There was a story a few years ago where a self-checkout machine in Tesco
didn't do this for some voucher, and a guy just photocopied it hundreds of
times and it worked :-) Oh here I found it:
http://www.timesonline.co.uk/tol/news/uk/crime/article1572721.ece
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