This is a frequent occurance here in the UK. There were that many shells dropped in the world wars that did'nt explode, and people now and again come
across them. We have a fair few washed ashore where i live, years ago a part of the forest where i live was littered with old ordanance and we used to
take it home
Many a time the bomb disposal was called out to a kids house round here before they totaly cleared the place.
CX.