1)She had a physical address to act as a scrying focus. Lydia still has her old jacket; thats another.I at least want it for focuses of the crown, to locate Katrina's hidden stashes of emergency funds, treasures, magical artifacts and blackmail on her fellow monsters she almost certainly had.
We are not lacking in valid scrying focuses for when we figure out how to travel by the NeverNever and show up in Boston.
Assuming we consider it important enough to be worth following up on.
2)Im assuming Gard, Mathews or the White Council will get to them first.
They all have first mover advantage; Gard and Mathews were present at her death, and the White Council will know as soon as Dresden makes a call and report. They have the resources to physically follow up from Monoc and the Winter Court respectively. They can deniably launder that stuff in ways we cant afford atm.
The White Council have a Warden in Boston to investigate her place immediately, and Dresden is Warden regional commander.
He'll have made the call.
Until we can physically travel to Boston, we cant do anything about that.
By the time we do so, all but the most obscurely hidden stuff will have been picked clean by others.
Still, Gard, Mathews and the White Council are all better alternatives than the Daedalus people, or some of Holt's cohorts.