It doesn't mean you can't see them, it means there will be a random NPC bodyguard there or something of the sort. Your manager also works, or anyone like that. You've just gotta assume they are floating around in the background at the moment to keep people from doing anything funny. They don't have to be an active part of the log, though, as long as your characters aren't starting shit.

It primarily means that you have to recognize that your label is using due diligence when it comes to preventing rebellion.

Character can send packages to the other label but it won't be clear whether or not it will actually make it through. (It may or may not, depending on what it is and who it's from. This is sort of up to narrative choice, so it can be a problem if that kind of thing is interesting. Alternatively, they can give presents in person.)