If sitting long. A good, very good fuel drain is good (mandatory) shake wings is part of it.
CASA permit requires a LAME to say is good to fly and all AD's need to be done. Also any requested things from CASA.
So with new information - Bolt removed to service other aircraft OR to cause death. Even if in a hangar, why put cuff back on and nothing holding wing up/on? Very dangerous and stupid to do.
Interesting nothing reported on this.