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Your dealer should be able to give you a TPW which will tell him what week the car is scheduled to be built. As it gets closer, he should be able to zero in on the exact date.
By Purchased, I assume you mean that you ordered one. Your dealer should be able to give you a weekly update. Here is the link to the codes at EVS courtesy of Rick "Corvette" Conti. My 08 order is currently at 3400