Version 1 (For humans): Your working the nightshift when your boss called you saying that a shipment for a new animatronic came in and he want's you to open it, when you get there you see all the other animatronics crowded around a box. [FNaF 2 or sister location. your choice]

Version 2 (for animatronics): You overheard that a new animatronic was coming in and that the nightguard had to open it up.  when the shipment came in you huddled around the box with your friends trying to figure out what the new animatronic was. [FNaF 2 or sister location. your choice]