I spoke with a CPW officer and was told that I could legally have 20lbs of unprocessed meat in my possession and that if I wanted to have more I would have to have the meat processed. Either way my brother will have to fill out a donation form (handwritten note with info). The law for this is on pg 15 of the big game brochure. below are the parts that I thought were relevant. I also asked for a definition of processed and he said I didn't need to go to a processor and that off the bone and in ziplock bags would qualify.
When I asked about bringing the antlers back he told me it was no issue and would be the same as a shed. I'm not really confident on this one and will be calling back to hopefully confirm with another office. It seems like this would be a big loophole for poachers.
Donation certificates are required for all game-meat donations. Certificates
must show names, addresses and telephone numbers of donor and recipient;
donor’s hunting license number; species and amounts donated; date of
kill; donor’s signature. The certificate can be a simple note; no special form
required. It must stay with the meat until completely consumed. Donor and
recipient are subject to bag and possession limits.
1. You can donate to someone WITH or WITHOUT a like license:
a. any amount of processed and packaged game meat, anywhere.
2. You can donate to someone WITHOUT a like license:
a. up to 20 pounds of unprocessed meat, anywhere.
b. more than 20 pounds of unprocessed meat, only at recipient’s home.
3. You can donate to someone WITH a like license:
a. up to 20 pounds of unprocessed meat, anywhere.
b. more than 20 pounds of unprocessed meat, anywhere, only if:
(1) recipient’s license is unfilled, and
(2) recipient’s carcass tag is on the meat. This establishes recipient’s
claim to his/her portion of meat and voids his/her license. Donor’s
tag must remain with his/her portion.
c. the entire carcass, if:
(1) recipient’s license is unfilled, and
(2) donor’s carcass tag and recipient’s like-license carcass tag is on the
meat, voiding both licenses.