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.