It came to my attention that we are having trouble accessing containers until restart on exile servers from the extended base mods package. I have found a solution to allow access without requiring server restart.
Check key bindings under:
Keyboard controls > Custom Controls > Use action 1 - Mine is "T" Yes this is also the key for advanced movement and can conflict with it at times.
Anything you point at (including vehicles, doors, etc) within an undetermined (probably 5m or less) range will lock or unlock depending on current status.
When a container is placed it is locked with default code of 0000
If you point your crosshair at the item and hit "T" it will give you key pad enter the 0000 and it will unlock giving you access.
Unfortunately this does not solve the missing "Change pin" from the context menu.
At least you don't have to wait for restarts anymore to access your containers.