Suspicious estimated purchase date of iPhone 15 Pro Max

I got an iPhone 15 Pro Max from one of my friends. I was curious about whether it was brand new or second-hand equipment. I checked the first letter of the serial no which was M and showed that the iPhone wasn't refurbished. Then I started deeper research on it and I was faced with something fishy.

Firstly, I checked the Apple Support website to validate my iPhone's date of purchase (approximated activation time), however, when I selected my device there wasn't any date of purchase (only the device name and serial were shown).

Next, I tried iUnlocker, and this time I found the date of purchase.

Secondly, the iUnlocker showed that my device's estimated date of purchase is 29 May 2024 but I noticed that the last cellular data rest is 3 Mar 2024 !!!

Isn't this suspicious???