Missing 411-Western United States & Canada: Unexplained disappearances of North Americans that have never been solved: Volume 1
About this deal
A good enough guess should allow you to try to force and maximize the coincidence by removing all normal ways of the expected manipulation happening naturally.
Sure, it would be somewhat difficult to hide the act of construction, but again, even your standard government can pull that off. Victims’ families are left without closure and the Park Service refuses to follow up or keep any sort of national list and/or database of the missing people. The most low-tech version that I can think of, some combination of taser and GHB, would clearly be inadvisable for use on children and should kill some people.
Meanwhile, after Dennis went missing, the Key family, looking for bears some distance away, saw a dark man-type figure carrying something on its shoulder, a key piece of the puzzle. Once you come across one, you know that following it will get you back to civilization within at most a day.
Or to put it another way, a pattern of correlations is when the same things keep happening more frequently than they should by chance, while a pattern of coincidences is when unique, extremely unlikely events keep happening in connection to a person, event, phenomenon, etc. While there is a database for incident and criminal reports, it is not widely or consistently used and it doesn't interface with other criminal databases. The interest in the book series prompted the creation of a documentary film based on the Missing 411 books; this film was released in 2017.
It’s also unusual that it seems that it’s young children who much more often tend to remember and report anything, as opposed to adults. If there is evidence that something weird was going on with the dog, that’s the part that should be focused on, in my opinion — presence of inexplicable evidence is always more interesting than a correlation alone.