Missing 3 days worth of emails after starting an email migration

Missing 3 days worth of emails after starting an email migration

I started an IMAP email migration for multiple email accounts today (afternoon of Oct 12) and during the process, emails currently in the inbox of several accounts went missing. They are not in the trash nor spam folders. The missing emails are dated from Oct 8 - 12 and are extremely important, so it's a major hinderance that they cannot be accessed. If you are able, I need to have these emails restored as soon as possible.

Thank you