I think i have deleted by mistake an invoice, how do i find it as i may not have waited long enough once i pressed the save button?

Hi there, @gsatutte-bigpond.

I'd be glad to help you get the information of the deleted invoice in QuickBooks Online.

You can use the Audit log to trace the transactions done in QuickBooks. I can show you the steps below:

1. Go to Settings ⚙ and click Audit Log.
2. Select the Filter and enter the possible date to see the complete information of the deleted invoice.
3. Locate the transaction and click View under the History column.
4. Click on the drop-down icon to see the details.
5. You can get a screenshot of it so that you can create a new invoice with the same details. Here's how it looks like:
   
   

To know more about the Audit log, you can check out this article: Use the audit log in QuickBooks Online.

I've added a reference which can be handy in the future if you have repetitive transactions such as creating monthly statements to your customers: Create recurring transactions in QuickBooks Online.

You are always welcome to comment below if you have other concerns or questions. It's my pleasure to help. Take care.