Yes, though my character received a bonus on the check since he got to see it's hidden mechanism due to it being damaged before he used mending spells to repair it.Out of curiosity, Ambrus - did you, by any chance, solve the puzzlebox?
This might be against the spirit of the thread but why do you need a value for the phylactery? Are you going to be able to sell that ANYWHERE?
It doesn't stop being a masterly intricate puzzle box simply because there's no longer a soul inside. Even though it's non-magical, it still retains its value as an art object.Value if trying to sell a phylactery at the local pawn shop - 0 GP.