Long boots

I bought boots, but I want to fuss and realized they are not for me (because I can't find identical ones like I had before). They are only tried on, haven't been worn outside. There's a zipper at the back, but it's optional to use. The shoes are labeled size 39, but in reality, they fit size 37 + a sock. I'm not measuring the insole; I'm a store model for determining the exact size 37 ;) Shipping is paid by the buyer.