As the title says, I bought a new open-box MacBook Pro Mid-2015 Retina(manufactured in 2018)from a seller on eBay. It has AppleCare till 2021. I now have the device, and have registered it to my Apple ID which shows the date of purchase and the AppleCare. But if I bring it to a Apple store will I need a receipt? Or is it being on my Apple ID enough? I thought about EFI locking my MBP which made me wonder about how I’d handle unlocking it ,if I somehow forgot the password, without a proof of purchase. Thanks!