I don't see any evidence of the "rand" and it should be evident by the way the beers are situated in the fridge with the missing places. I didn't think they sold bush beer in anything smaller than a 30 pack unless you buy pounders.

My best guess is that someone who was already drunk stocked the fridge and just didn't give a shit or someone is afraid of germs and that way there is no chance of a stranger touching the top of a beer that someone else might be drinking.