What is the procedure for returning a defective item when one of the two sellers is absent?
Chapter on Selling the Musarrah (Animal with milk retained in udder)
Al-Mughni
Book of Sales
Primary text
If one of the two sellers is absent, the buyer must return the absent seller's share of the item to the present seller, proportionate to that share of the purchase price. The absent seller's portion remains with the buyer until the absent party returns.