UMs: Whatnot

After making all the previous posts on here from the r/unresolvedmysteries subreddit, there were some that I came across after making the different categories of posts and/or just ones that I couldn't really categorize, so, here's some assorted stories you can read while listening to the theme song cover:

Yet another theory as to the identity of DB Cooper, but it does seem pretty plausible: 
https://www.reddit.com/r/UnresolvedMysteries/comments/s43bp1/could_john_a_k_ziegler_zegrus_be_db_cooper/

The Jersey watcher was a guy terrorizing a town in the 1920s with extremely detailed letters:
https://www.reddit.com/r/UnresolvedMysteries/comments/q2furi/what_happened_to_jersey_watcher/

A woman in Tallahassee, Florida calls the cops on a couple of well dressed man with a group of very unkempt children. Turns out there is a lot more to it than just a possible kidnapping:
https://www.reddit.com/r/UnresolvedMysteries/comments/k0pmz9/the_finders_of_lost_children/

The famous power substation attacks in San Jose 2013 remain unsolved despite being national news at the time:
https://www.reddit.com/r/UnresolvedMysteries/comments/ho953y/an_unprecedented_and_sophisticated_attack_on_an/

A seemingly deaf-mute man appears out of nowhere in 1955, Czechoslovakia, after being targeted by secret services for years, his identity is unknown to this day:
https://www.reddit.com/r/UnresolvedMysteries/comments/ekji4i/a_seemingly_deafmute_man_appears_out_of_nowhere/