In Holes by Louis Sachar, what did X-Ray ask Stanley to do next time he found something? What was his reasoning behind this?

X-Ray tells Stanley to give him the tube because he has been there longest and deserves a day off.

As unofficial leader, X-Ray seems to have a lot of power over the group.  For example, he chooses a special shovel that he thinks will make it easier to dig a hole.

[The shovels] all looked the same to Stanley, although X-Ray had his own special shovel, which no one else was allowed to use. X-Ray claimed it was shorter than the others, but if it was, it was only by a fraction of an inch. (Ch. 7) 

X-Ray chooses this shovel because the boys have to dig a hole each day that is as deep and wide as the shovel.  He figures that a smaller shovel results in a smaller hole.  Since the shovels are five feet long, any little bit helps.  The boys are supposedly digging to “build character,” but they also have to turn in anything they find.  If they find something good, they get a day off from digging holes. 

One day, Stanley does find something.  It is a fossil of a little fish.  He is told that the warden is not interested in fossils.  Then Stanley notices that X-Ray is watching him.  He pulls Stanley aside. 

"Say, listen," said X-Ray. "If you find something else, give it to me, okay?"

Stanley wasn't sure what to say. X-Ray was clearly the leader of the group, and Stanley didn't want to get on his bad side. (Ch. 11) 

X-Ray tells him that he has been at Camp Green Lake for almost a year, and hasn’t found anything.  He also claims that his “eyesight's not so good.”  He does not believe Stanley deserves a day off when he has only been there for a few days.  Stanley reluctantly agrees to X-Ray's request. 

Stanley does find something else.  It is a gold lipstick tube with the letters K.B. on it.  He doesn’t want to give it to X-Ray, but X-Ray spots him with it as Stanley is wondering if it is interesting enough for the warden.  X-Ray takes it, and Stanley suggests that X-Ray wait until the next day to turn it in since he is almost done with the day’s hole. 

The next day, X-Ray waits awhile, then gives the tube to Mr. Pedanski.  He gets the day off and an extra shower.  The warden comes out to see where it was found.  She looks around in the dirt, and then tells all of the boys to start digging where X-Ray said the tube was found.  Of course, they are digging in the wrong place, but only Stanley knows that.