3-Digit POs ultimately get paid by International Seafood Doctor, Inc. 5-Digit POs ultimately get paid by Seafood Doctor, Inc. 3-Digit PO# 197 5-Digit PO# 21752 Everything that we import in is through Seafood Doctor, Inc. We have the Customs Bond only for Seafood Doctor, Inc. so we can legally import product into the United States. *On Proforma Invoices without a PO# assigned to them, we ultimately attach a PO to them at the time we get the ISF details. This is why we have some Proformas without POs written on them.