well when I was a kid, I watched my mom water-witch up the location of the septic tank on a house we'd bought... because it wasn't were the plans said it was. so it could workGo sit on where the porch is/was relax and ask yourself where would I? Have you thought about dowsing? Forget the naysayers here. Give it a try! You might be surprised. At this point it can't hurt.
1CompassGirl Get an Airlel picture view of your property and dowse it with a pendulum what kind of metal detector are you using ?
I consider that a possibility Don't know much about how all that works though, percentages, privacy, the lot.
... before ... of course! Dang there's so much about solving this kind of problem I don't know! Ok, gonna go look, there's a county history society, maybe they'd know were to find those!My eyes are too old to read all these posts so excuse me if I'm repeating another's post.'
Get aerial photos of the area that were taken before the jars were buried. Then see if you can match landmarks.