True, but I don't think we'll be able to get at those until the red court is in the process of falling. Their prison is almost certainly one of the most well guarded places in their domain.Killing or freeing what is left of the Red's juiceboxes is still a valid option and removes their offer.
Maybe we could cause them enough internal chaos that they don't have the ability to maintain negotiations?
It's mentioned repeatedly in the books that the council is absurdly good with finances. Compounding interest plays a role, but they're so good at it that it's a favored weapon for attacking other long lived supernatural powers.
I bet it'd do fun things to their logistical situation if the white council gained access to a full map of their holdings and the credentials to mess with them.
How'd we get them? Cyber devils in Ortega's stuff. Why'd she have access to it? Dunno, plotting against her dad or something. She's not exactly going to drop by to defend herself.
Leak it to McCoy and he'll at least see it used even if he's suspicious.