Test your serial number on Apple's Check Coverage website. if no purchase date is validated, then you have fake Airpods Max.
Fake AirPods Pro which all features work.… - Apple Community
Trying to Pair Counterfeit AirPods May Prompt Warning in iOS 16
AirPods Pro 2gen fake vs original - Apple Community
Fake AirPods: How to tell if AirPods/AirPods Pro are fake
The internet is filled with very believable knockoff AirPods Max headphones. Here's how to spot a fake. - Yanko Design
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Convincing AirPods Max Scam Sweeping The Internet.
I Spent $150 On Knock-Off AirPods Max's - Was It Worth It?
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Fake AirPods Max Vs Real: How To Avoid Scams (2024)