I wouldn't bet on it. I lived in a small NJ city that had a post WW II Korean ammo barge loading spot. After a bit, the workers got too cavalier about how they handled said items. After the following blast items were found scattered all over the place. Land mines, grenades, and the occasional artillery shell were found for years. I was in grade school in the 50's and we had annual lectures from the EOD people about what to look for and what to do (I.E. RUN AWAY FAST).
An artillery shell was found in, of all places, the public library and was a Korean War type. Result: building and 2 next door evacuated, EOD visit, firemen and first aiders on standby and general hoo-hah. The grenade the kids found, if correctly made, could have gone off. If a frag grenade it would be very nasty if you were close. Lucky kids
Biting the hand that feeds IT
