Rule 634 A person in possession of an order on himself for the payment of money, or delivery of a thing, is presumed to have paid the money or delivered the th…

If someone has a written order that told them to pay money or hand over something, and they still have that order in their possession, the court will assume they already made that payment or delivery.

Think of it like a bill or invoice. If you paid it, you'd likely get the receipt or document back. Having that paper in your hands is seen as proof that you took care of what it asked.