What should the buyer do regarding the remaining final installment of the furniture price, given the seller's procrastination in fully delivering the furniture, and then his disappearance?

The rich man's procrastination is oppression, and procrastination is the prevention of fulfilling what is due. The last installment owed to the shop must be paid to its owner. If the owner is the worker, then he must be sought out. If he cannot be found, the amount should be given as charity on his behalf, with him being given the choice, if he is found later, to either approve the charity or take his right. In this case, the charity would be for the giver.