J1 Disappears

J1 has been working on graveyard shift with Musclehead for a little over a month. I stay until two or three in the morning sometimes working mass overtime, which puts me well into the first half of the grave shift. J1 will show up each evening around 11pm and at precisely midnight he will inform Musclehead and I that he is going to lunch. It's strange that he would go to lunch only one hour into his shift. Since I've been staying so late into the night I wondered where the hell J1 was disappearing to. Hours after he should have been back on the production line jaw-jacking us to death I'll realize how still and quiet the test area is. Then I look up at the clock on the wall and I know he should have returned from lunch a long time ago. Musclehead told me most nights he doesn't come back at all. He doesn't want to get involved in the situation by going to management about J1's evaporation act, and to be honest neither do I. I have to assume J1 has enough vacation time saved up to leave work and he must be calling our boss and letting him know by voicemail that he's not working his shifts.