In the novel The Wise Man's Fear (The Kingkiller Chronicle: Day Two), the Lockless have a box that cannot be opened, and so Kvothe is sent to discover a way inside.
What clues do we have at what is inside of that box?
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When Kvothe stumbles across a traveling group of entertainers that were a little bad off due to their bear dying of a dog bite gone sour, there was a boy who recited a riddle about the Lackless family:
Seven things stand before
The entrance to the Lackless door.
One of them a ring unworn
One a word that is forsworn
One a time that must be right
One a candle without light
One a son who brings the blood
One a door that holds the flood
One a thing tight-held in keeping
Then comes that which comes with sleeping.
Wise Man's Fear, chapter 108
I know this isn't the appropriate place for speculation, but there are subtle hints in his books, that will later be revealed no doubt, giving the reader a bit of foresight. I strongly believe the riddle told to Kvothe by this boy is obviously what is needed to open the Lackless family's door of stone, as there is sometimes a strong truth behind the little riddles and songs the children chant about. I believe it was the Caudicus who told Kvothe of this door, oddly similar to the one in the university's archives that he has a strong fascination with.
So, with all that being said, I believe the riddle suggests that whatever is inside the box, it is part of the seven things needed to open the Lackless family's door of stone. Though this might answer your question partially, it's certainly something to think about.