Did he take the sheath as well? If so that could be a good reason to call some people to get the sheath back. That would also require the park ranger to be honest and not keep the knife for himself.

If this was me I would consider it a lesson learned and paid for. Then I would buy another Scrapivore while they are available and donate an equal amount of money to Knife Rights to become a member.

Then I would email Doug Ritter of Knife Rights and ask him for their plans for supporting a knife preemption law in California. So far they have had good luck in a lot of states, making any knife legal and making it impossible for local ordinances to be able to overrule state law.