Rubber Band Ball Geology

Say you are a bored programmer in 1998 and you make a rubber band ball.  But not just any rubber band ball.  You make one that is solid to the core, no cheating with a super ball, or cork.
Then you forget about it for 10 years.  Then you find it.  It is weathered, the outside dried and cracked.  Rubber bands flake away until you reach a solid mass of discolored and melted bands.
If you were to cut open the ball it would not fall apart.  In fact it would look like the core of a commercial ball.  The center still spongy, but compressed molded together.  It is like geology in action.  I am just upset if didn’t find a diamond, or better yet oil!  I could have at a solution for our engery crisis.  Just create a ton of rubber band balls and wait 10 years for a few drops of oil.  Just like ANWR.