I have to agree with Quest4toknow, the remains (teeth) should be returned to family, But I wonder if they would ever get to the family, if they are turned into authority's, I really doubt it, unless someone would do DNA testing on all of the prisoners family, and then the teeth, and many of these men we probably had no record of them being in that prison camp, or what happened to them? could these be one mans teeth (you said not a grave, and I do not think a prisoner would be buried with gold, if he was sick and had gold teeth falling out he would trade them for food or supplys, but I do not think these men were in camp long before any thing value was taken from them including gold in their teeth(that is if they had not had everything taken from them before they ever got to this camp), i the guard's would probably broken their teeth out of the prisoners mouth’s or pulled them, by order of officers, these are probably teeth from several prisoners (and you may find more) this I think would be the buried treasure you seek not some liquid, or powder, although a possibility).
If they were using aqua regia they may have been recovering the gold (you said you found melting crucibles, to me this means they were most likely melting it back into gold), now I do not think officers or people high in rank would want or need to hide gold in liquid form, but maybe a guard doing the work (for the officer), may have been steeling some of the officers loot. like buried teeth, or maybe a bottle of aqua regia or precipitated gold powder, a metal detector, and maps of the camp may yield clues on where to look, the bottles could have been anything, not necessarily acids, but the crucibles are more likely close to where the values may have been processed, where from there did guards sleep, and use the toilet? People are like animals they use the same trails, over and over most every day until something changes their pattern, find the guards trails to his hiding spot.
Can you find any old map of prison camp? Where guards lived and prisoners were kept other buildings (or clues building foundations) (trash dumps) fence lines or wire?
being gold in a war camp the guards may have been pulling prisoners teeth and any value they had, they may have been using aqua regia to dissolve the gold on site, and melting it, but I do not think they would have buried the liquid or dumped it into the ground, (could be wrong) they would dump the waste liquid though, and could have buried some gold.
If you have heard these stories about this place, many other people most likely have heard the story too, and many people may have searched for the hidden treasure. Unless something happened to the man who hid it (he would have went back and got it), most treasure stories (probably have no treasure), but the gold capped teeth are a good indicator some one did not get all of this (are these teeth gold? Or could they not have been gold (or look like valuable metals, and were discarded and not worth processing?), Maybe another clue?).
