I would say yes.
https://app.leg.wa.gov/wac/default.aspx?cite=220-413-090(2) It is unlawful to possess or transport big game animals unless evidence of the sex of the animal remains naturally attached to the carcass until the carcass is processed and/or stored for consumption.
(a) Evidence of sex means the head with antlers or horns attached or penis or testes of male big game animals or the head or udder of female big game animals any of which must be naturally attached to at least one quarter of the carcass or to the largest portion of meat.
(b) For the purpose of this rule, "stored for consumption" means at the final point of storage prior to consumption of the meat.