Good point Ozeb - however, I am an atheist, and simply try to do the right thing in life - but sadly, it seems to be a one way street. The reality is, that this mobile phone is useless to me, and I could simply throw it in the bin - but it might be important to the owner. If the owner did not give a bit of a "thank you", then that would be a reflection of their meanness.
I found a pair of thongs a couple of months ago - I never bothered to look for the owner - and I still wear them