Stolen bikes

so about 3 weeks ago i biked past this nice pink fixie (very poorly locked up) everyday on my way to work, on my way back home one day and i see it outside a pub not locked up and further down the road the lock, snipped left on the road. i took the bike from outside the pub and took it to the police staion. i asked some other fixed riders around cambridge if they recognised it ect.. they didn't. so after 28 days i can claim this bike. if i eventually do claim it would it be right of me to sell the frame or use the parts..? im feeling very confused about it.. thanks..

Did you leave a note in the spot from where it seems to have been stolen (e.g., near the snipped lock)?