I had a similar issue with the OEM locking bolts on my A4 and ended up buying another key from Audi, I went to order one and was told they had them in stock??? I was surprised to see the guy get a box of around 20 keys and grab one which he handed over and charged £5, " how do you know it'll fit " I asked..... " cos they're all the same throughout the VAG range" he answered!
I promptly went to Halfords and had my eyes out over a set of McGards which i still have fitted to the golf. I could'nt stand the thought of any Vag owner being able to get my wheels off.
Strangely, I bought another set of McGards in the tapered profile for a different car and the key was the same????
So that just goes to show there is always a chance that some scrote 'could' have the key to fit your locking bolts