Taking his stuff is complete BS. The officer obtained consent to get in the house. You (the owner) NEVER have to give consent to an officer. It's not cooperating, it's the law. There is nothing the officer could have done had your buddy said no he couldn't come in unless he had reasonable suspicion, which he didn't, and in turn, he asked for consent. I normally will never give consent to an officer.
OK, so you guys forgot to check the deer in, I've done it before as well. So slap me on the wrist and let me be on my way. Getting consent and taking all the man's mounts and what not is below the belt. He needs to retain counsel and get his stuff back. That is such a crock. Sorry about the rant, but I just tried to imagine if that would've happened to me and my buddies. Decades of hard work and good times/memories confiscated? Wow!