iPhone 17 pro max US variant warranty terms

I am planning to buy iPhone 17 pro max us variant or Japan variant which is easily available in the local shop, but they are not willing to provide the bill . Will I face any difficulties in claim warranty in future? Please share your experiences

Nope, just make sure the phone isn’t activated, the warranty starts from activation date.
Used a 13 pro JP edition, had no issues buying AC and getting battery replaced.
Using a 17 pro JP edition as well right now.
A lot of the shops activate the phone, reseal the box and sell it.

Did they ask you for the bill ?

Nope, didn’t ask when purchasing AC or while getting the battery replaced.