Hi, I'm John!
Since your account was compromised/hack, it’s possible the attacker deleted or moved your old emails.
Please check your Deleted Items folder and click “Recover items deleted from this folder” at the bottom, sometimes older messages can still be restored from there. Also check your Archive or Junk Email folders. "Recover and restore deleted items in Outlook" https://support.microsoft.com/office/recover-and-restore-deleted-items-in-outlook-49e81f3c-c8f4-4426-a0b9-c0fd751d48ce
If the emails don’t appear under “Recover items deleted from this folder,” it means they’ve been permanently removed from the mailbox and unfortunately can’t be recovered.
To prevent this from happening again, I recommend turning on two-step verification and reviewing your recent activity page to make sure your account is fully secure. "How to help keep your Microsoft account secure" https://support.microsoft.com/account-billing/how-to-help-keep-your-microsoft-account-secure-628538c2-7006-33bb-5ef4-c917657362b9
Let me know if you have any further questions or concerns.