How to get both creative prop and agent from carryable spawner device

Right now I want a way when someone throws a carryable object into a zone, I can get the volume it hit, and the agent that threw it into the volume. Right now you can only use a prop manipulator to get the agent that threw the prop, or the volume device to get the prop that entered the volume. So you kinda have to choose between one or the other. I understand you can make a map to keep track of throws and pickups but what if both players throw at similar time and one hits before the other? The wrong players will get the reward for that.