
Did the thing slither up the wall in the shop to get to the ventilation ducts?
The article says it was a big snake that had been in the shop for 10 years. A long python can raise up in the air quite a distance. If the herpetarium was, say, five feet below the ceiling the snake could have reached a vent. In another comment there is a suggestion that the boys should be checked for strangulation marks with a rope pattern.