The retailer that took your payment runs the return, so their window and their process are the ones that count.
Because checkout happens on the retail listing rather than here, the return is theirs to process. Open your order history, find the item, and start a return from there. You will get a label and a deadline in the same step. Nothing has to come through us first and routing it through us would only slow the refund down.
It happens more often with the finishes that sit close together, and Fog Gray and Charcoal are the usual suspects on a phone screen. That is a straightforward retailer exchange. If you want to be certain before ordering, the colors page puts every finish side by side, which is a more honest comparison than one photograph at a time.
A vacuum seal that has failed, a cap that will not hold, a bumper that has split: those are manufacturing issues rather than returns, and the warranty page covers them. If you are inside the retailer window, their replacement is still the fastest route, and the warranty is there for afterwards.