They didn't take you wallet maybe?
That happened to me once. A bit my fault though. Whilst riding normally, a couple in a car yelled at me - get off the 'king road or something - I squirted water from my bottle through the open window (It was a very hot day) . They stopped, we tussled and without my knowing, the driver reached around and grabbed my wallet from my back cycle top pocket. I took off - without knowing he'd taken my wallet.
A few moments later, I realised the wallet was missing, and went to the nearest police station (Just up the road) to report the loss/theft. They did the same - to hand the wallet in. Having both cooled off by then, we shook hands and sheepishly apologised to each other.
The cops just looked on and shrugged their shoulders.
It's now long enough ago I can 'fess up....