How do I verify the authenticity of a newly purchased S24 Ultra, and how can I check its warranty coverage ?

I request Buds 3 Pro users to post a full review of it.

I saw a deal in the morning that after three Tap & Pay payments a voucher of ₹500 of BookMyShow will be given to the user. I completed the said three Tap & Pay payments. But in the afternoon the deal disappears. They make their users fools.