Yes, so far at least two people have unsuccessfully gone for the dagger - Pinnochio and Cora, and it did not go at all well for either.

Be interesting if they address how August figured out Neal was Baelfire (he clearly knew Bael's history - because I think August/Pinnochio wrote the book that Henry keeps giving his parents or is carting around with him), when they don't address other things. Writers address the oddest details, yet leave other details unresolved.