So a couple of months ago I found this...
I thought I got them all out and started locking the door to the bathroom to keep Elise from playing with toys in the toilet. Although she thought it was quite fun!
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A few weeks ago, the toilet started flushing slow and seemed a little off. The problem did not magically go away on its own so today I broke down and called the plumbers.
After removing the toilet, shoving things through it, shaking it, wiggling it, almost hurling it into the street, and turning it upside down, a little orange stacking cup finally came out.
Money well spent!