We dont have these things here like signs on trees for treasure.
We do have and have had for Gold reef deposits, piles of Quartz. Old timers used to when they found traces in quartz mark areas with Quartz piles, say a dozen bits that stood out.
Unfortunately, over the years, from the start of detecting times, idiots piled up Quartz knowing that as a joke to stooge people. Its not uncommon to see them now. Has been for over 30 yrs. I personally spent too much time chasing up, or should say checking the areas, that I now dont bother. Not to say that is what happens in your country but here im done.
I still have a look at the more out of the way ones, obscure ones, but dont hold my breath!
Good luck though you guys with tree signs 👍