I have read it all. I'm not just talking to the OP, I'm responding in part to posts such as this:
Pocket1 Tue 27-Dec-11 08:49:52
Just do it - but with conviction otherwise you may fluff it or they'll may cotton on. Tell yourself....
whoever bought it for you did tell you it was from Waterstones Picadilly branch
The other ladies are right that it's not strictly honest but these stores factor this into their pricing.
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OP, I wouldn't do it because it would be dishonest. Honesty is when you give someone all the facts and allow them to make the decision.
I don't know what Waterstones think about it or what their policy is, and I already said that if they are happy about it, it doesn't matter.
But I'm surprised at people saying try it, it's fine, when there was a thread about taking something back to another shop a few months ago where the OP knew it was from somewhere else, and she got completely flamed. (no not by me, and it wasn't me either!)
I don't think it's a good idea to blur these sorts of boundaries. Waterstones might be fine about it or they might just accept it to save themselves the hassle...other shops though will care, will lose money, etc etc if people try to justify this sort of grey-area fiddling.
Do you see what I mean?