This looks like it could be interesting - Bent Society? is a blog by a professional criminologist called Mike Sutton. There is a good piece here about government lead property marking schemes. Choice quote from one particular scrote interviewed by Dr Sutton:

Another interviewee said that he was never affected by property marking, saying that he stole it anyway:

“…the criminals is always one step ahead of them [police]. It doesn’t take long for someone to sit there with a bit of brain on ‘em and fuckin figure out how to fuckin decode it, get rid of markings or whatever. And you always know somebody like that. There is always going to be somebody like that [who could remove property marking or security features for the thief or fence]. When you’ve got a proper buyer [Commercial Fence] who spends money getting it sorted out he will.”