I accidentally archived a certain number of emails and now I can't figure out where they are.

I understand that they get archived in All Mail but they were emails from months ago and I don't know the name of the senders (I book bands they were just unread emails that I wanted to make sure I looked at). So I can't find ANY way to find the emails I archived without knowing the sender's name. I get hundreds of emails, and wouldn't be able to recognise what I lost.

I tried to match up the dates with my Inbox and All Mail to see if I could find which ones were different, but the dates get all muddled with sending and receiving - there doesn't seem to be an easy way to just look at what you received on the day it was received.

HELP! These are so important but I'm stuck.