All of your assumptions appear to be correct. Here are some nice
links in case you want to explore some more...
The horizontal plank mask that you posted does indeed appear to be from
among the Bwa (Boua or Bobo-Fing) people of Burkina Faso although I can't say
which animal is represented by this particular mask. For a very complete
and fascinating article on "The Art of Burkina Faso" by Christopher
Roy, find it on the University of Iowa "Art and Life in Africa" site
(Excellent site!!!) at this link:
The second image is of a mask from the Southern Kuba or Kete peoples.
See this link for a mask and some information about the particular stylistics
associated with Southern Kuba and/or Kete, masks: http://www.remnantsofritual.com/gallery/090.html
I will search for more specific data soon...
Finally, below are some images of Tuareg daggers, swords and scabbards
from the American Museum of Natural History in New York. The first images
is, I think, particularly interesting for the
structural similarity of its handle to the three-pronged handle on
your sword. The second image helps to illustrate the common coloration of
the hide embellishment -- particularly the turquoise -- which is commonly found
on various leather-worked Tuareg items.