Update Jan. 7, 2022: Although the recent fire has devastated some of the local businesses, this bonus and the waypoints for the adventure lab are still accessible.
This is a bonus cache for “Hillsboro History Tour - Now and Then” Adventure Lab.
You must complete the 5-step adventure lab to get the coordinates for this cache.
You can play the Adventure Lab on a free phone app.
The coordinates will be in the last journal entry.
After completing an Adventure Lab, unfortunately the last journal entry simply flashes on the screen before the app takes you to a screen to rate the adventure and leave a log. You do not have to rate and log immediately, it will wait until later.
If you want to see your last journal entry now (and get the bonus coordinates for this cache), simply go back out to the map, click on the completed adventure, scroll down almost to the map where it says "View 5 Journal entries". Clicking on this takes you to the first entry. Swiping from right to left takes you to the next, etc until you get to the final entry and the bonus coordinates.