What if u lost ur receipt but u got it like 4 months ago from Apple Store

I got my lumme case at the Apple Store but they send me the receipt threw email but I deleted it and I wanted to know if I can exchange for a new one because I left it on my black table and it didn't work.

LuMee Duo LED Lighting Case for iPhone 7

LuMee Duo LED Lighting Case for iPhone 7

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