Here's a couple more, thanks to this community
#09 Lake Don Julio House, NA - Credit to Viceman
#16.4 Under Owanjila Dam, WE - Credit to Cutter De Blanc
#27 Two Crows, South of Armadillo, NA - Credit to gtagrl & Viceman
So, to summarise there's:
8 Newspaper Cheat Codes
23 Found Locations
6 Unknown Locations?
These many locations in each State:
Ambarino 7
Lemoyne 4
New Hanover 4
West Elizabeth 3
New Austin 5
#14 Be greedy only for foresight
#16.1 Guide me better
#26 You want something new
#30 Keep your dreams light
#32 You want freedom
#33 You want everyone to go away
So close, only 6 more remaining!