Having looked at multiple videos of the activities, black SUVs, suited people, some people wearing baseball caps etc. at Nancy Guthrie’s home today 2/25/26, IMHO this is what happened:
1. The bad news is that the sheriff has exhausted his department’s investigative ability, and they have now released the crime scene
2. The new $1,000,000 rewards have generated new interests, including perhaps large investigative firms. Savannah Guthrie has the means to hire these types of investigative teams
3. The good news is that the new people who came today are (90% sure) Intelligence and Investigation Agents, Executive Protection Agents, and undercover FBI
4. Intelligence and Investigation Agents (IIA) are of the type Private Investigators such as in a marital misconduct or inheritance dispute, but they are employed by large firms with legal, financial, scientific etc. capabilities
5. Usually, IIA travel with Executive Protection Agents (EPA). EPA are not to be confused with bodyguard (special police officer level). Besides protection, EPA do pre-planning of deployment, travel management, crime scene management, risk mitigations, and investigation
6. While local law enforcement may have released the crime scene, usually IIA and undercover FBI agents collaborate. IIA are hired after local law enforcement finished their job but the FBI may continue investigating beyond routine. Hence, they collaborate with private companies. It would not be surprising if some FBI agents not wearing badges were present today
7. I do not know if I may post their website but you may google ASIG American Special Investigative Group as an example of such private firms. ASIG has IIA, EPA, and even specialized professionals called "Missing Person Investigators."