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I agree entirely with North Star.Who's to say how the unfranked stamps came to be. I've often had to remove stamps from envelopes I was going to send only to find for some reason, I didn't need to e.g. I mucked up the address or received correspondence from the person you were going to write to before I could send the newly stamped envelope to them. It's a very grey area and one which is hard to prove malicious intent in deceiving the Post Office..Another question I have is : can stamps be used as legal tender. I got a bill from Amex for 26p! So I sent them stamps!