Free: Contests & Raffles.
Not legal. They must not have been hidden to good if you were able to find multiples of them buried in the snow.
Do not mess with them. Let Enforcement figure it out. It is unlikely but they could be legal. Tribal members can set these type traps on land. Also APHIS is not required to follow the law on bodygripping traps however they do voluntarily to my knowledge.As mentioned you can get a special trapping permit but you cannot get one to set conibears on dry land.