The truck arrived around 2, the delivery crew quickly carried it to the patio, and left. Bad consumer--I took a superficial look while they were here, but really only to make sure it was for natural gas and not LP. I started removing the packing tape and protective films, then decided to make sure the new cover I'd bought would fit....but it was too small.
I first got mad at Amazon, then checked again (really to make sure the larger size in the same brand would fit). Measured the grill. Measured the grates (easier than getting a tape on the overall length). Walked next door and measured Brian & Robbie's Spirit E-310. Concluded I have a Genesis E-310 on my patio, not a Spirit. You'd think the "Genesis" on the front would be a clue, but Weber has been playing around with the Genesis brand name for a while and I'd discounted that.
The upshot is that Lowe's offered to let me keep it at the price of the smaller one ($519 vs $719). I don't care about the color (dark brown, not the black I'd ordered), and while I don't often need a larger grill, I don't see too much downside in it. And I don't want to have to deal with a pickup, then another delivery.