There are a whole series of special lug removing sockets for the different styles of locks. My local mechanic sent me home with 8 of his to take off the lugs on my BBS wheels. They would also hammer on but had reverse threads to them so they would bite the lock - all you had to do was pick the one with the correct taper angle and the right diameter.
Cats out of the bag on the LS1/LS6 blocks now!
Is there an identifying code on the RPO tag or were they just used as they came down the line? I understand quite a few of the 02 collector's editions got the LS-6.