10-23-2019 09:59 AM
You don't really need to do anything for the warranty except keep your receipt/notate when you got them. Apple's system tracks everything by serial numbers and they are notified when a serial number is sold so they know when the warranty starts. If you ever need service on them, all of the Best Buy Geek Squad's are now Apple repair centers and they would just look up the serial number of your unit to judge service eligibility.
In short, no worries you should be fine.