Wash. Admin. Code § 220-354-040
It shall be lawful for a common or contract carrier to transport during seasons in which the taking, catching, or possession of chinook or silver salmon is unlawful in the state of Washington or in waters over which the state of Washington has jurisdiction, an original package or packages containing either silver or chinook salmon which original package or packages both originate from and are destined for some other state, territory or foreign country: Provided, That for the purpose of this regulation the term "original package" shall mean a package from which fish cannot be extracted without an opening or breaking thereof and which is accompanied by documentary proof that the original point of shipment and the point of destination are another state, territory or foreign country: Provided further, That it shall be unlawful for any such carrier to open or break any such original package while the same is in his possession, except for the purpose of reicing: Provided further, That the waters of the Pacific Ocean shall not be considered a state, territory or foreign country.
Wash. Admin. Code § 220-354-040