Crazy question. Almost makes me think you found a drone and are wanting to know what you should receive for returning it.
So let me take you back to a time when morals were something your parents should of taught you.
If you find something,...it does not belong to you. If you know the rightful owner,......you should return it with no expectation of reward.
If you do not know whom it belongs to,....you should call the authorities and report the found item. In general,....they will take your name and information. If no one claims that item after a specified time,....then it is given to you.
If someone found something that you lost,.....would you not want the same courtesy.
As far as giving someone a reward that finds something of yours,......give what you feel is right and fair. If as an example the drone landed in his/her yard,.....and they simply walked it back to your yard,.....have a pizza delivered to them. If they braved, elements,....climbed mountains and valley's, crossed the desert, risked life and limb because you expressed the need for the return of that item,......then the reward goes up with effort put forward by the rescuer.
It is sad what I have seen become of this worlds work ethic and morality. People like Tesla, Roosevelt, Churchill, Bell, Eisenhower must all be turning in their graves.