I've found a few more.

Get the updated set in
THIS POSTING.
It helps to know where to look, so the attached placemark is a grid which
approximates where the pairs are located. It's generally valid though most of the city, though less so in the southern and eastern border areas.
If you want an area with perfectly aligned watermarks, see the set for Maine, USA.
Ime, I found the other half of the pair about 95 meters southeast.