You've come to the right place for finding your deleted purchase order in QuickBooks Online, @bi3.

A quick and easy way to locate transactions in QBO is by running the Audit Log report. This report helps you keep track of added, deleted, and modified transactions, as well as user entries. It allows you to see the history of changes made to individual transactions or a range of multiple transactions. It can be customized by using the Filter tool to narrow down the data.

Here's how:

1. Go to the Gear icon.
2. Select Audit Log.
3. Click the Filter drop-down menu.
4. Set the date range.
5. Select the Transactions checkbox.
6. Click the Show drop-down menu and select Deleted/Voided Transactions.
   
7. Click Apply.
8. Locate the deleted purchase order and click View to open.
   
9. Select Show All to view the details of the deleted purchase order.
   

I've got some articles here to help you navigate with the search function and I'm sure you'll get the hang of it in no time:

• Use the audit log in QuickBooks Online
• Find, Review, and Edit Transactions in Account Registers
• How to Search for Transactions

Should you need further assistance with finding transactions in QBO, don't hesitate to comment down below. I'm always available here to help. Wishing you all the best.