48. Why do the boys want to find “Number Two”?

The boys believe the treasure is hidden in "Number Two".

What! bury it again and leave them to come and see the ground disturbed? Not exactly—not exactly. We’ll take it to my den.”
“Why, of course! Might have thought of that before. You mean Number One?”
“No—Number Two—under the cross. The other place is bad—too common.”