re-bones: the japanese gov. used to pay well for the bones of fallen soldiers (ain't matter the circumstances of death), yet you "should" provide details of your discovery. Either you tell the truth or make up a story. Sure is that there is a gov.japanese treasure hunting recovery team very active here,they know everything about the sites,well trained,and have access to anything needed,but the way they work is sadly to say "bad". Dont trust them (no disrespect to japan).
If you find a skeleton in a tunnel - dont touch it, dont remove it - analyse it it might (should) give you details, signs of direction of "perhaps" the gift deposit or a cache or?! look out if there is a bone missing,every detail means a lot ! a finger missing?! usually in caves are 2 guardians,but once can find many more skeletons,maybe the helpers,POW, yet again every detail is important,b4 you remove any bone ! If you open a cave or a site where the bodies still more or less intact, again - analyse everything, depending your air supply,or inside a cave most probably in the chamber will be 2 guardians, always take your time, dont do anything hasty ! be prudent !