Gmail help re: missing emails

Ok, so last summer I had sent and received a number of emails with a future employer. I have all of them (sent and received) except for the ONE back and forth I’m looking for.

I’ve searched up and down, went through every single email during those dates in every single folder and can’t find the thread. It’s literally 3 emails in the chain and they’re gone. I didn’t delete them. I never delete emails.

Any way to recover them?

Like I said, I’ve searched with a number of key words, the sender’s name, everything. Every other email shows up.

Thanks in advance.