They may have done it, but in New Mexico it can be easily made to ‘unhappen’. The level of government corruption in New Mexico equals and thing that Chicago can come up with plus there a lot of desert to bury the bodies. (14 year resident)
Have you seen the open oil/tar disposal pit owned by former governor Bill Richardson?
It’s probably a 640 acres of unknown depth.
Whatever you put in would never be found and would never float up (as water is heavier than the oil).
I’ve been waiting on it to burn for a decade.