Maybe they just took the servers that were used for/labeled as email or other corporate purposes and left the storage farm that had all the content on? Assuming

Maybe they just took the servers that were used for/labeled as email or other corporate purposes and left the storage farm that had all the content on? Assuming a segmented network I would think all the corporate servers were on one network (possibly all in the same racks) that was probably obviously labeled and the storage servers were identical arrays on another network.