There's great advice. Cause damage to your phone, completely your fault, and then try to hide it and return it, and be sneaky about it, and dodge personal responsibility. 🙄
You need to take it in, if you don't have Applecare+, purchase it, and if anything else goes wring with it, they will replace it. That is, IF they allow you to purchase the Applecare with a ding. They might. You now have 60 days to purchase it after you buy your phone. When I washed my 5S, they replaced it fully for $79.
Basically, if you can't live with the dings, It's going to cost you at least $179. You just need to live with it, or own your mistake and pay for it.