They certainly define how possession is terminated, and taking the birds home definitely does not terminate possession. § 20.39 Termination of possession. Subject to all other requirements of this part, the possession of birds taken by any hunter shall be deemed to have ceased when such birds have been delivered by him to another person as a gift; or have been delivered by him to a post office, a common carrier, or a migratory bird preservation facility and consigned for transport by the Postal Service or a common carrier to some person other than the hunter. I'd like to see the language in the state regulations that states possession limits only apply until you get the birds home or that possession is terminated once you get the birds home. I hunt Oregon at least once a season (a buddy of mine has a bunch of property on Sauvie Island) so I try to stay up on their regs, and I don't ever recall seeing anything that suggests that possession limits don't apply once you are home. In fact, from what I've seen, the OR regs mirror the federal regs with regards to possession limits and field possession limits.