Signs Recovered! Seattle Parks department took them for the night.
An employee from the Seattle parks department brought our signs back today 24 hours after they disappeared. Not sure why they took them instead of returning them right away. I guess they didn't have time. Apparently we are not allowed to put them on the Ravenna green space...no problem I will put them on the corner in a spot that is legal and won't get in their way, and lock them from now on. Thanks for all the comments and concern.