Can you tell me what?
Please elaborate what information you are looking for.
5YNG3
I don’t recognize that as a valid model number, but my information is not exhaustive.
ZP/A
Apple model numbers with ZP/A are traditionally intended for the Hong Kong and Macau markets. Their packaging should include labels and printed information in languages for those markets.
The initial product would get the /A designation. Any official change to the product, bundled accessories, or packaging would result in a /B for the revision.
I purchased an iPhone 16 pro as a new one
Did you buy it from an Apple Store or Apple Authorized Reseller? You should.
If not, then you are taking a risk for buying products that may not be what you expect from it. Either for new, genuine parts, or warranty.
Apple officially discontinued the 16 Pro on 2025-09-09, so they wouldn’t sell it as new after that date.