If the car hung up, like maybe the pistons racked, and there was a down call perhaps the seal on one of the pistons relaxed. if that were the case you should have seen oil on the outer portion of the Jack. if the head of the the jacks are higher than the tank, then the low pressure switch should have tripped. Is there any heavy equipment near there that uses hydraulic oil? A theft is a possibility. How does the Oil recovery system in the pit work, is it a pump, or just 2 buckets?
