Good find! Yes dealers such as the one in your link are using RF ID tags on vehicles to function as work orders and track vehicles on their lot and in their service dept. However they hang an id over the mirror and remove it when the vehicle is picked up by the customer. The sticker behind the mirror is more of a permanent id given to that vehicle...so they can keep track of the vehicle everytime it is brought in for service. The best RF ID tags can only track something up to about 150 feet or so, if that. So the dealer can't track anything once the vehicle leaves the lot. I guess your dealer is on the cutting edge of technology! I wonder how many other BMW dealers are using this technology...

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2008 X5 4.8i - Jet Black / Black Nevada Leather / Specs: Every possible factory option