Sounds like someone caught a GW on an off day. Only case I can think of for a bow is a card case like my brother has for his bear bow. But honestly who is going to drag a cumbersome case around to put their bow in?
This is similar to what Bebo has but he HATES it and only uses it to store it at home so all his stuff doesnt get lost. Not once have I heard of someone needing to case their bow. But I suppose laws regarding that do differ state to state