export certificate as in auction sheet for a JDM vehicle?? it is not required for registration neither it is made part of original registration file. So if the auction sheet is not present in the file it is insignificant.
Export certificate from Japan is only issued for NEW UNITS shipped by OEM to their license holder partners as part of shipping bill. Without that paper insurance is not issued and freight carrier decline loading.
auction houses does not insure the vehicles prior to shipment so hardly any Auctioned vehicle documents have any export certificate.