Well it turns out Kiote Koins fit perfectly in toilet paper rolls so I put on in the bottom.
I cut holes in the toilet paper roll.
Then I put some Volkman cockatiel seed (no sunflowers).
I wedged another Kiote Koin in the middle to create two chambers to hold the seeds.
I put more seeds in the second layer and sealed it up with a third Kiote Koin. They still haven’t figured it out.