Hi @Lance Schrum ,
Welcome to our forum!
Most is still there but a lot is missing.
Do you mean that most emails are in Deleted Items folder but a lot are no longer in your Deleted Items folder?
If so, the next place to look is the Recoverable Items folder. As i know, If you've permanently deleted an item in Microsoft Outlook or Outlook on the web (formerly known as Outlook Web App), the item is moved to a folder (Recoverable Items > Deletions) and kept there for 14 days, by default.
Please try the below steps:
For Classic Outlook for Windows:
For Outlook.com and Outlook on the web:
More information: Recover and restore deleted items in Outlook
Hope to help you!
If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.