ZeroBounce.Net stores all your invoices in your account. Use the menu on the left hand side and click the "Invoices" link under "Account Info". If you're already logged into your account simple click this link: My Invoices
The invoice ZeroBounce.net provides in your account is for your convenience and can be missing information needed for tax related expenses and account purposes, which is not provided to us by PayPal.
ZeroBounce.net only has access to the information that PayPal provides us on your order, which can be very limited. PayPal protects the customers data and doesn't transmit information that is not needed for the vendor to complete your order. PayPal will also send you a receipt for your records and those receipt should be considered the receipt of records as they will have your full information on it.