I don't think he meant to steal the tooth brush, I think Kevin forgot it was still in his hand when he was moving back from Old Man Marley, it would have looked a lot more obvious if he had.

He didn't run very fast, the lazy fatty.

This days the policemans will take the video on the phones and say to the shop boy
"Dont worry, we will follow up on the case, buna"
And then he will go for coffo and donuts and forget about this one, hana

That whole scene was stupid.