User blog comment:Mr4Bidden 0nion/Strange Coffin in "Cry Wolf"/@comment-2.98.180.150-20140712132455

If you read the comic series, and I'll try to explain without any spoilers, there are a group of wizards and warlocks who go around capturing the most deadly evil and powerful entities in sealed objects. They call themselves Boxers and perosnally seal the strongest witches and evil spirits in chained boxes.

This could possibly be such a box, which could mean whatever is in there is far more dangerous than the crooked man