I was sent an email but when I clicked on it, it was no longer in my inbox on the gmail app. How do I find it? ?

I was sent an important email concerning my package from amazon. I immediately clicked it and I was taken to the Gmail app. I was looking at my inbox and there was no recent sent email. I looked through all my folders, spam and everything on the left tabs for it. I even looked at the message I sent to look at the conversation thread the company had replied to but it was not there. Where could I look for the message? 

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