Test your serial number on Apple's Check Coverage website. if no purchase date is validated, then you have fake Airpods Max.
Apple Airpods Max - Real vs Replica
Fake AirPods: How to tell if AirPods/AirPods Pro are fake
Real vs. Fake AirPods Max: 5 Tests to Tell the Difference
I bought these fake Apple products on the Temu app — and I was totally shocked
Save $60 Off a Brand New Pair of Apple AirPods Pro - IGN
Fake AirPods Pro which all features work.… - Apple Community
How to spot fake AirPods and avoid getting scammed - Swappa Blog
$37 Fake To $200 Fake Does It Sound Better?
AirPods Pro 2gen fake vs original - Apple Community
Go get that airpod max you're wanting to buy : r/Airpodsmax