Reviving this thread to bring you this message:
no, I do not think these are authentic boomerangs.
Some months ago I found a typology of Australian boomerangs:
https://www.aboriginal-bark-paintings.com/aboriginal-boomerang/And found my boomerangs do not seem to fit any of the types.
Searching for some examples I fell upon this site selling stuff:
https://www.carters.com.au/index.cfm/index/2220-australian-aboriginal-artefacts-...Many of the boomerangs are described as being from western, central, etc. Australia and look like they should according to the typology.
And suspiciously many boomerangs look like the spitting image of mine.
And do not seem to fit any specific typology either. And they are NEVER described as being from any specific area.
Search for "kangaroo" and most of the boomerangs with this description fit the above points.
Not only that, few other boomerangs have figure carvings as intricate as those kangaroos and emus. Some have patterns and stripes and such, and THEY look like their described area of origin.
They were probably made in some modern workshop and are what souvenir boomerangs looked like back in the 50-60's.