Your dealer is usually the best source of info. If it's telling you it knows nothing, then it's either not making any effort to find out things like the TPW, or it's clueless about how to get that info off its system. Either one isn't complimentary to your dealer. Perhaps (?) it's your salesman who may not know his/her way around? I'd suggest dealing with the sales manager who should be more "in the know". Establishing good lines of communication with your dealer will come in handy, when (for example) your car arrives and you're working out final pricing/payment details, ordering accessories or considering an extended warranty, and getting servicing. Now's a good time to forge that link.
Shane is great providing accurate info however so many Corvette people contact him, I expect he's overwhelmed at times and people on the US Corvette Forums have suggested we not bug him as much. Good luck!