Really depends on what those other four were doing while you were away on the 5th.

Generally the guys on their GM team are knowledgeable enough to know what a multiboxer looks like. The difference being in control of all 5 versus some rapid fire AFK macro where you kill stuff running into a wall and loot-a-rang over and over again seemingly AFK.

I would steer clear of doing anything like that. At that point it isn't even IsBoxer or Jamba related. It's keyboard autofire and WoW macros botting.

I say this as someone who sometimes herb gathers on 5, fishes on 5 and obviously uses loot-a-rang most of the time on 5. As long as it's you directing these actions Blizzard won't care. And yes it's pretty obvious when it's an AFK farm.