Unusual "ball" shape Pima (Akimel O'Dham) Basket - Unique

Description

A unusual possibly unique Pima (Akimel O'Dham) Basket.  Looks to be c/1920-1940.  This is 2 separate bowl shape baskets that are fastened together at the center. They do not "come apart".   This was done in the traditional herringbone weave rim finish with a 2.5" gap where the 2 rims are not joined.
This basket is made of the traditional yucca and devil's claw over grass bundle coil.  One basket has a 4 petaled flower of devil's claw and the other has a striped pattern of an alternating devil's claw (darker) and yucca  (lighter).
This basket is 1"diameter at top and bottom, 4.5" diameter at center and 2.75" high.
Where the 2 baskets remain unjoined there is a bit of wear at the rim of the striped basket.  This is what would be the top of the striped basket (or 1/2 the ball) has a rim of yucca whereas the "petaled" basket has a rim of devil's claw.  The wear/damage is clearly visible in the photos --  it could be placed at back of display and basket would appear perfect.
Were there small hard objects added thru the hole to make a rattle?  If so, they are no longer inside - it does not rattle.  Did this hold something in some way precious?  If so was the damage to the rim made in removing this item?
Was this used as a sort of ball to toss around and perhaps play some specific game?
The herringbone weave of the devil's claw that joins these baskets is the same material used to weave the darker parts of both - so it is local material and appears to be same age as rest of basket ---  so I believe the basket weaver that made the 2 small baskets joined them together.
I have not been able to find any other Papago, Pima or Apache joined baskets or references to such.  If anyone has the answer to what this was used for...  please contact the seller and educate me!  (Thanks in advance)
Since this a unique piece I have no easy way to price it.  I am setting a starting bid that I believe reflects the uniqueness of the item as well as the slight damage to it.