2005 EXPEDITION: YAMASH-I-T-A ( JAPS) TREASURE
joe,
dont post na lang where this is for your protection. What you are looking for is a tunnel--that's right a horizontal tunnel covered by probably a cement or stone plug. We cannot determine where it is unless you got more signs.
The cave where you found the ball, thats not where it is, but you got plenty of sucker deposits arranged in a circle the ball being the centre (just guessing but the fact that it is clear probably means its in water? not sure), it should be enough to retire on. 1 inch corresponds to a unit in a sexigesimal system --- 6, 12, 36, 60, 120, 360 feet not sure which one. The ball announces the fact that this is legitimate and big site with one main cache and other smaller caches. If you didnt know that, you would go away thinking you recovered everything,,.news articles would come out, the Japs will fly in, look at your ball and promptly purchase the supposed empty site for a song. That is what they intended.
But if you want to go after the tunnel...
You can use a GPR to locate the maine cache tunnel entrance. If you dont have access to one, you can look for signs marking the tunnel entrance but you wont know how deep to dig. They can be marked by trees planted in an unusual formation or it can be pointed out via arrows on rocks. Also look for animals carved on rocks or 3d statues and formations...birds, turtles (but i dont think you will find any here), snakes, fish, peoples faces, monkeys. These aren't stick drawings...they can be pretty ornate showing all the body parts. Take a look at my first waterfall picture...do you see the three faces on the left side of the picture? Hehe gee we were on the way to another dig when I saw that and I told my companions, this is where it is at.
The signs can be the size of boulders or it can be small. Generally the smaller the sign, the closer you are. Post some more things if you want. Dont worry if things seem ordinary and you seem to be stretching your imagination -- because that was the intention of the people who buried it there. Oh there are always traps, so far you havent found any trap signs according to my pal here.
Oh by the way, that square stone in the river, dig three and a half feet below it and tell us what you find

...you need to dig in at an angle--the direction of the bottom of that rock (how many feet is it from the ball)?
Good luck.