3 years ago an Alaska wildlife trooper landed at our camp and inspected the 3 bulls we had hanging in meat bags. He made us lay out EVERY single piece of meat on tarps and counted them. He counted every rib to make sure there were not any missing. One bull had one rib missing in the middle of the ribcage as it was impacted by a bullet and destroyed. We cut the ribcage in two pieces and left the shattered rib. He was going to write us a ticket, but after an hour decided not to when we showed him a picture of the kill site and what we left behind. He could clearly see the rib was shattered and in multiple pieces. He lectured us on keeping all of the coagulated meat around the bullet entrance and exit, saying "it's edible", although I heartily disagreed. Although we were very respectful and professional, this particular encounter was intense and he wanted to write a ticket badly. He said he was surprised he couldn't find us in a violation of anything. The only thing we were missing was ONE rib bone in the middle of the ribcage. If it were not for a picture, we would have got a ticket. He said the subsistence hunters don't want to see anything go to waste, but when I asked if they keep the ribs, he said "not usually". It was a weird encounter. I don't blame him for doing his job, but using common sense and seeing that our meat was in immaculate condition and meticulously cared for wasn't important to him. Counting rib bones was important.
So, here's my advice- take every rib bone with you. Take copious pictures of the kill site and your cutting up the bull. I take pictures of each carcass throughout the butchering process... maybe 30-40 for each animal. Take a picture of the site when you leave and a picture of your GPS to show where the carcass is located. I take a picture of cutting the harvest ticket and the locking tag so he knows which animal it is. Keep the bulls separated and do not combine the meat in the bags back at camp. If you choose to eat any of the rib meat in camp, still take every bone out with you and don't get rid of them until you are at the village airfield. Make sure you take all the neck meat up to the ears. Document everything.
When you leave the kill site make sure the ONLY things left are the hide, guts, spinal column, and hooves. Otherwise you're asking for a ticket.