You think the police are going to bother with a case like this? Please.
A couple of months back there was a cash point paying out double cash just around the corner from my office. A massive queue formed, with people waiting in excess of 30 minutes to take out as much cash as they possibly could, using every card in their purse, etc. I didnt get involved in this, as to be honest I was in the pub having a beer at the time and I couldnt be bothered, but not a single person from my office has been chased over what are some rather large sums of money, and there is much more of an audit trail with something like this than there would be with what the OP has done.
I'm not saying its right, I'm just saying all the 'You are going to get in trouble with the police' crowd are having a bubble.