CA and DA had their phones tapped in March 2016; the Bump was in April 2016. Agent Sanford testified in 2018 at the trial of SG + KM that those were the only relevant phone taps applied. There was slightly different content from the phone conversations presented in 2022 when KM was retried...
I have never heard of a specific date when the recording of conversations were discontinued; the original warrant does have an expiry but given what it yielded withing hours of the Bump, I believe it would readily be renewed if there was any demonstrable indication that more evidence of a capital crime could be forthcoming.
So in October 2023 a much larger fraction of the phone tap recordings were revealed in CA's trial but CA was arrested in 2019 so presumably, phone recordings would have terminated by that time...At least as it applied to CA. The latest date of phone exchange presented in the trial of CA was, IIRC, in early 2017.
So the questions: Is it possible that the FBI had been recording DA after 2017? Or even after CA was arrested? (that event would certainly represent another stimulation for exchange for the Adelson conspirers and their counsel...just like the Bump) Is it possible there may be recordings for DA and WA conversations between 2018 and 2019 and possibly even later? Could LE have gotten a warrant for WA's phone after 2018? I certainly believe they could have, that establishing potential probative value would have been simple enough.
If so: the whole Direct Examination of WA during the October trial was portion of a 3-D Chess Match and WA may very easily have perjured herself and LE has the means to prove that. Use immunity may already have been sacrificed....
JMO, MOO and entirely speculative.