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Which one? IIRC there are 16 different patterns that the wheel locks come in. If you can post a picture of your wheel lock, those of us with keys can see if ours might be a match.
Otherwise, if you're in a pinch, a tire shop should be able to get them off without more than a little cosmetic damage to the locks. I forgot my key when I was getting my summer tires mounted, and Discount Tire got them off with barely a scratch.
Well, every Mazda dealer has a set of all of the keys in their shop...if you don't want to ruin the locks (I believe you can buy replacement keys), they can take them off for you.