If they did, I suspect their business model would collapse
Do the likes of cash convertor check for markings?
Great having your stolen gear marked. Apart from the fact that a tiny percentage of stolen property is ever recovered to check for your markings. And if your stuff gets stolen in 4 years and rocovered a year later they couldn't care less anyway. According to the blurb they will just ask you to remove the stickers as your right to display has expired.
I just **** on all my gear. Seems to be a good deterrent as nobody nicks it.