For Teenage Mutant Ninja Turtles, Vol. 6, a few things:
With 1/GW, I confirmed that there is a TRADE paper (1/GV). The foil is a virgin. There is no foil version with the trade dress. Those are hard to get good images, but the best I can do is below. Barcode is 82771403316806511.
For 1/HA and 1/HB, per the back cover, the cover artist is Raymond Gay, not Kyle Willis. The cover art to 1/HA seems to be some sort of preliminary image. It’s missing the issue number in the lower left corner. Barcode of 1/HA is 82771403316807111.
With 1/GC, the barcode in the Core is 82771403316807111. That is the barcode to 1/HA. Per this eBay auction, the barcode to 1/GC is 82771403316806411.
Thanks!