Hello there, paragonuniforms1.
Retrieving the deleted invoices isn't available in QuickBooks. We can view them in the Audit Log screen. This serves as a record of all the changes made on a specific transaction.
For more details about the Audit Log, here's an article that you can read on: The Audit Log: What it is, how to use it.
Keep posting here in the Community if you need anything else.