Well Carl, you did reply your questions yourself very well.
We are actually merchants, we do not dig the septic tanks our self. Somebody else did, and then they must wash them first before they sold to us. After the years, the
becomes fertilizer. We didn't even watch them digging, that was the story what happening. It does happen all the times, most of the times they keep it quiet some time they can't. Like our neighbor demolished their old house to be rebuild. The workers hit a wall and coins pouring out, mobs came to pick them up. You never really know where the coins were before you have them. That is what makes it interesting.