Several details that stand out to me:

1) Daniel left the site in the middle of work without telling anyone.

2) His phone could not be pinged for reasons also unclear.

3) The state in which his vehicle was discovered, with only his belongings still with it.

4) The black box to his Jeep indicating he had somehow crashed his Jeep, tried restarting it over 40 times before finally getting it to start again only to crash it again 11 miles later.

This is a brain scratcher for sure. Thank you for sharing it, Jennifer!