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The lugbolts and key should have come with a piece of paper that has a code on it. If you have that, you can take the code to your Mercedes dealer (or, if it's not the Mercedes set, contact whomever makes the set) and have a new key made. For the Mercedes units, the paper normally resides in the little plastic box that the locking bolts came in, and should now contain the normal bolts that the locking units replaced.
Take it to MB dealer service department. They have master keys for all of these locks (FYI, MB is using 8 distinctive patters in the US market, but most of the vehicles are supplied with one of the only 4 distinctive patterns, one of which is your key, a "cross"). Wheels thieves have these master "keys", a full set of 32 are sold on eBay for about $100 (or lower).
Get Rimgard wheel locks from Sweden instead, but do NOT loose Rimgard keys (replacement is pricey). A bit pricey at $300-$400 depending on MB wheels, but thieves won't take your wheels, they can take a car, but not the wheels.
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Slideshow: A one-of-one U.S.-spec Mercedes-Benz SLR McLaren Roadster became even rarer after a factory-backed transformation at McLaren's headquarters.
