I agree!Don't pay too much mind on VIN. I ordered mines from Ferman in Tarpon and keeping track of there deliveries through United Road. They are receiving Tahoe with 333xxx and even a 342xxx vin #. I am 337 and still waiting. It's a total crap shoot.
I'm a 27XXXX, and I've seen plenty move well after mine was built. There is no rhyme or reason. I honestly don't think GM has a clue