I admire that George. Dowsing for stones that have gone. I can do it myself as it happens.
I understand someone welched on a £100 bet with you recently. May I step into the breach? I bet you £100 I can find every single one of the stones that are no longer present at any location you care to specify.
I only have 2 stipulations: don't ask me to repeat it the next day or to wear a blindfold as scepticism distorts the energetic flows.