Thank you for posting here in the Community, @Scott12.
I'm here to help check the invoices that were sent and not.
To check the invoices that were sent to your customers, you'll just need to visit the customer's profile and click on Sent Email.
- Click Customers at the top menu bar.
- Select Customer Center.
- Select a customer under Customer & Jobs.
- Click Sent Email beside Notes under Customer Information.
On the other hand, for the transactions/invoices that were not sent, you can check them under Select Forms to Send.
- Go to File.
- Select Send Forms.
- You can check the transactions under Select Forms To Send.
That would allow you to check the invoices that were sent and not. If you have any other questions about sending invoices, don't hesitate to add a comment below, I'd be glad to help. Have a wonderful day!