As for the charger/cable, it appears they provided new store stock in the original MacBook box. Battery Cycles: While not terrible, it has 17 for an open box. That seems high considering the long battery life to hit 0% and fully charge that many times. I suppose it is possible with the max 45 day return window. Manufacturer Date: Checking Coconut Battery, the manufacturer date is 2020-10-19. That sounds like original launch stock, but shouldn't a recent open box at Best Buy ... More on forums.macrumors.com

I bought a open box Mac book pro from Best Buy last week. when I am checking the apple coverage online , it says "please validate your purchase date". I think we get a 1year coverage even when we buy Open box from Best Buy? ... what is my coverage expiration date I want to check my coverage expiration date as I have enter my MacBook ... More on discussions.apple.com

I used to work there. People usually return items in mint/great condition because of all types of reasons. Couldnt afford it, impulse purchase, wife didnt approve purchase, you name it. It still comes with the same exact warranty and return policy as new items, if it saves you money go for it. More on reddit.com

Also thats not sold by bestbuy. Its sold by a 3rd party More on reddit.com