I'm wondering what 'clues' might be gleaned from their message/image?
The first paragraph,
“Some things are happening in the Chambers case,
as I type this.”
(the part I bolded) caught my attention.
I don’t want to read too much into it, but some of the possibilities I can think of are (in no particular order):
They are conducting a search;
The new owner of PaPaw’s truck have decided to cooperate and allow a cadaver dog to search it;
Someone with relevant information has finally come forward, and they are interviewing this individual.
Maybe the investigators with the Texas Rangers and/or the Office of the Attorney General, working with the DNA, have gathered enough evidence to charge one or more of the suspects in PaPaw’s case with a federal drug crime. Perhaps they are using that as leverage to try to convince the individual(s) to cooperate with them in PaPaw’s case:
“Another difference between federal and state drug laws is the severity of consequences after a conviction. Federal drug charges generally carry harsher punishments and longer sentences. State arrests for simple possession (i.e. possession without intent to distribute the drug) tend to be charged as misdemeanors and usually involve probation, a short term in a local jail, or a fine -- depending on the criminal history and age of the person being charged.
[SBM]
Sentences for distribution and trafficking generally range from 3 years and a significant fine to life in prison -- with trafficking carrying higher sentences.“
Drug Laws and Drug Crimes
Clearly, my imagination is running rampant today

....