How to tell if an iphone 5 is water damaged?

I'm going to be selling my iphone 5 to a company online that buys phones. This website classifies a "faulty" phone as being water damaged. I have dropped my phone into water twice before but after putting it in rice for a day it always came out working fine. I'm wondering if, even though the phone works fine they'll be able to tell that the phone has been water damaged? As I know that there's some sort of indicator inside the phone.

Inside there are things that change colors to indicate water damage.

Needs to be taken apart. Inside is a piece of reactive sticker. If its get wet it changes color. That way any service will know if the phone was exposed to water or not.

If it freezes and not work or if the scream don't show you need to take if apart you can google or watch how on youtube

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