I need a copy of the original email with attached invoice that we sent to a client. The client has sent us a copy of the invoice, and the bank account number is not ours

Great to have you here, LaptopLand. 

The Audit Log serves as an audit trail that lets you see exactly what changes were made, and who made them. It maintains a log of each financial transaction as it is added, changed, or deleted. To see the original invoice sent to the customer, follow the steps below: 

1. Go to the Gear icon.
2. Choose Audit Log under Tools.
3. Select the Filter button.
4. Select the appropriate User, Date, or Events filter to narrow the results.
5. Under the Events section, click the radio button beside Show only these events, then check the box beside Transactions.
6. Press Apply.

The Audit Log will display all the transactions made on the account based on the filtered date. Once done, locate the invoice you've sent, then click the View hyperlink to check the status of the email. If it's successfully sent, there'll be no error displayed beside the Delivery Error section. If it's unsuccessfully sent, then there'll be a "Bounced Email" status displayed beside it.

Just in case you need further assistance and verify the original invoice sent to your customer, please reach out to our Customer Support Team. They'll pull up your account in a secure environment and assist you with your concern. To ensure we address your concern, our representatives are available from 6:00 AM to 6:00 PM on weekdays and 6:00 AM - 3:00 PM on Saturdays, PST. Here's how:

1. Go to the Help menu at the upper right.
2. Select Contact Us.
3. Enter your concern.
4. Click Let’s talk.
5. Choose Start a chat. and type in your contact info.

Visit our QBO Help Article page to learn more about running your business in your account.

The Community will always have your back if you need anything else in QBO. Assistance is just one click away. Have a great weekend.