Finally got a moment to put some words down.
Something I noticed that was absent from the arrest warrant was anything reference internet searches. Any detective investigating missing children is going to subpoena cell phone providers, internet providers, to get search information and phone call history. We've seen it in many cases. However, we didn't see that here. I have no doubt that it has been done (or is in the works), but I don't think they used it for the warrant because firstly, they didn't want to tip their hand, and they had enough to get a warrant without it.
Now, I believe this also applies to Chad. There is no doubt an investigation going on Tammy's death, and I imagine they have done the same search on his internet activity and phone call activity. Wiping a device doesn't wipe the history at the service provider, fortunately. This group seems to think it is untouchable, and thus didn't attempt to really cover their tracks very much, if at all.
There was brief mention of financial investigations, but it seemed brief, but enough to know there isn't outgoing support. But, they can look back for some time and aggregate the data to look for patterns or other things that stand out. Due to banking rules, certain transactions will require a SAR, or suspicious activity report, to be filed by the financial institution. There's always a record!
Considering the data trail our major players here have left, I don't think the search results would shock anybody. Also, the FBI mobile command didn't park in Rexburg for no reason.
To echo some thoughts I've read recently - the lack of a sense of urgency, at least to us citizen sleuths. In my opinion, it is because they know the children are no longer living and they know where the people responsible for it currently sit.