I'm actually in East Meadow but work in NHP. I got my JB 7+ from Levittown target on Wednesday. Your're right, small world!
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I'm on ATT and was given Model A1661. I checked on Apple's website and that seems to be the model that supports CDMA and GSM. So at the end of the day, I THINK that they must only be selling the models that support GSM AND CDMA, and just putting them on whatever carrier the customer uses.
http://www.apple.com/iphone-7/specs/
Edit: See here as well for more information:
https://www.macrumors.com/2016/09/08/att-and-tmobile-iphone-7-models-lack-cdma/
Actually, this is a good thing if you are on ATT as I think having a model that supports both GSM (ATT) and CDMA (Verizon and Sprint) makes the phone have a bit more value if you go to sell.