What is the recourse if a defect exists in an item purchased, and a settlement is made for compensation involving a slave who is later found to be rightfully owned by another or to be free?

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If an item purchased is found defective, and a settlement is made with the seller to compensate with a slave, but this slave is later proven to be rightfully owned by another or to be free, the buyer reverts to claiming the valuation (Arsh) of the defect.