I currently have a side-quest to mail off a perfect rabbit carcass and a perfect squirrel carcass. When I approach the post office with a rabbit carcass the option to mail it remains greyed out.
I'm mid-way through chapter 3.
Searching google brings up conflicting posts on sites like Reddit. Some claim mailing is a feature later unlocked in chap.3, and some claim they've mailed the carcasses in chap.2. Some claim they need to be unskinned, and some say they've skinned them.
Does anyone have some confirmed information?