No - they weren't...
Indian Scouts were furnished Army uniforms - with the appropriate 'General Service' Eagle buttons.
Indian Police used the grey uniforms first used during the Centennial Exposition's Guards - 'their' buttons feature either an ornate 'G' (for Guard) or 'P' - (for Police).
These buttons are viewed as 'fantasy' buttons and first appeared in quantity during the 1960's - like the 'USS' crossed arrows - usually seen at gun shows.
After about 40 years - they almost look 'real' - don't they?
Vaya,
Scouts Out!