African Burkina Faso Gurunsi Tribal Hunters flutes?

I bought these from my favorite thrift not knowing what they were, but they looked so interesting and at only $6 USD for the pair I had to have them. They are 8 1/2" and 5 1/2" long
Google images tell me what they are, but not how they work or how old they might be.
Thanks for any additional information.
Mikey

 

https://wmic.net/mossi-bulbous-hunters-flute-a/

Are yours hollow, with an opening at the top of the large end?

 

Yes they are hollow. One end has a larger opening.
Two other small holes on th ed sides.
Mikey

 

Here is another, attributed to the Gurunsi (like the Mossi, in Burkina Faso) -

https://musicaparaver.org/instruments/type/aerophone/origin/western-africa/1616

And a description accompanying a bronze example, which notes that such flutes/whistles are widely traded and so may be difficult to attribute to a specific group in Burkina Faso -

"One of the most common musical instruments found among the various people of Burkina Faso is the top edge-blown flute used by groups of young initiates or senior male members of society. Flutes are used to accompany ceremonies in close association with local languages that are tonal and match rhythmical language patterns. It is reported that flutes such as this are played in competitions held during planting when the male who had finished his parcel would blow on his flute for recognition as the best farmer. Flutes are widely traded and therefore often difficult to attribute to one group or another."
https://wmic.net/gurunsi-bronze-flute-b-2/

 

That last link you posted is the one that came up on my google lens search and where i got my information. Thank you very much @2manybooks