Space grey 5s trim around glass

Well I'm headed to Apple in about 10 minutes. Today the very small trim between the glass and the metal band that encases the iPhone started to peel out. Noticed a small piece was loose and after inspection a piece about a half inch was easily removed. Phone has been in either life proof nüüd case or my Apple leather case since second 1. Never had this happen with any iPhone but I'm nervous if it continues some sort of moisture will get inside. Not to mention phones 1 month old and hopefully they give me no grief about swapping it out.
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