Free: Contests & Raffles.
Never had an issue. just make sure its a solid one. Not all cracked and falling apart. My dogs love them. If you're lucky, they will get used to the scent and start finding them!
My dog has been chewing sheds since she was a pup. I trained her with them, and the first time out she found a shed completely on her own. I was one proud papa! To this day, she only gets to chew on deer and elk sheds. I cut the elk sheds into manageable sizes.
My guess is that your pup would devour grouse wings and rabbit feet, and the small/splintery bones could be hard on their system, so I would be cautious. I played with grouse/pheasant/quail wings with my dog (tied to a tennis ball and played fetch and hide and seek), and let her carry them around but wouldn't let her eat them. It definitely helped with the scent recognition and feel of feathers.