As far as I know, the canvas ribbing would be cemented directly onto the insole, and any sort of filler materials would go on top of that, but I can't say for certain what that material is without handling it.
I went to Nordstrom and even the display models were poor quality. Something is seriously wrong with Wolverine, and it's more than just that people post more negative than positive. You don't see this in the White's or Viberg thread, and even the Alden thread has nowhere near these kinds of issues.
I think I'd tell them it's theirs if they can reimburse you for all of the shipping costs that you've had to pay throughout this ordeal, and the cost to actually return it to them. I'd at least give them the chance to do that, and if not, I'd sleep just fine keeping those boots.
I compare 2030 in its standard width to the same size in Barrie, D width. Barrie is a bit wider in the front and heel. I wear dress socks or thin SmartWool socks with my Barrie-lasted boots, but I can comfortably wear thicker socks with the 2030.