To further illustrate how common these items are, here are some of the sellers' pics for items described as "Negrito bolos" that were sold on the most popular online auction site since October, 2016.
All three blade forms are represented. There is one interesting presentation knife from the Commander of Clark AFB to Maj. Gen. Coverdale that reads:
MAJOR GENERAL ROBERT F. COVERDALE............COL JIMMY L. MAIURO
.................................................. ...........................COMMANDER
......................MOMENTO
(sic) OF VISIT.................374TH TAW (MAC)
.................................................. .............................CLARK AB
.................................................. ...........................PHILIPPINES
These "Negrito bolos" were probably readily accessible to personnel on Clark AFB. A map showing the location of Clark AFB in Central Luzon is shown
here, and it is apparent that it is close to substantial populations of Ilocano in the neighboring provinces of Pangasinan, Zambales and Pampanga.
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