NWT Isabel Marant Castay Boots

Brand new Isabel Marant Castay combat boots. Never worn outside, just tried on in my apartment! I realized they were too small but missed Shopbop’s return window. These are an EU40 (I’m a 9.5) but run small so I’ve marked them as fitting like a 9. Comes with Isabel Marant box and shoe dust bags. I paid $835 with tax, please make reasonable offers!