Were are my f***ing dust cap's

just yesterday i was in the tesco carpark in southport no sooner i pulled up and got out of my car i seen 2 little gits on push bikes going round with a plastic bag probley putting dust caps in there they seen me watching them around my car and got off but i expected to come out of the shop and them be gone but they where still on so i was lucky i caught them before i went in the shop they probley thought twice about taking them as they probley thought i would still be watching them from somewhere