I presume the saniflo operated after the toy was introduced?
If its gone round the bend then its probably harnlessly become lodged in the tank.
The toilet pan will need to be removed and, after turning off the power so you dont risk having your fingers macerated, you will probably see it in the tank and be able to retrieve it.
If it was thin plastic it might have actually been macerated and disapeared out of the drain.
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