DHL use the labels Non-Doc and Doc to identify the type of consignment.

Doc (non-dutiable)

These are consignments with no monetary value and are known as documents or general correspondence.

Non-Doc (dutiable)

All other consignments classified as dutiable by Customs may be levied customs duties and taxes for entrance into the destination country.

Note on Domestic Consignments: Domestic shipments are considered Non-dutiable or Doc.