1,206. Accidentally Given Someone Else's Property

182:11 If someone wants to sell an object that seems to be stolen, like fruit watchmen who sell fruit in a secluded spot, or a seller who carries some object in secret to the sale, or one who tells the buyer to hide the item, then it is prohibited to purchase the thing in question. One may not even purchase an item from a woman if there is reason to suspect that she is selling it behind her husband's back. Similarly, one may not purchase women's jewelry or clothing from a man if there is reason to suspect that he is selling these things behind his wife's back.

182:12 If one's dishes got exchanged with someone else's at an affair, he may not use the dishes he received because they do not belong to him. When the rightful owner comes to claim them, he must return them, even though his own property got lost. Similarly, if one sends his clothes to the laundry and they send him back a garment that isn't his, he may not wear it. Rather, he must return it to its owner, even if his own garment was lost. However, if he had the garment for a long time so that its owner invariably would have asked for it by now, then he may wear it. This is because we assume that the owner of the laundry has settled with the customer and paid him for the loss of his garment.