Duma may know the purpose of this??

[theking]

[DuMa]

I've seen the half avocado looking thing in viet/Chinese movies.

Old ancient kings would own these for wealth as they are pure gold.

The box description is for Green skin grapefruit so no help there

Tai means even.  Xieu is odd.  A gambling term when throwing dice. 

My guess is props or toys for cemetery offerings like burning fake paper money. 

[theking]

Cool, thanks!