> 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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