I hope I'm wrong somehow, but after reviewing those other messages, I don't think I am.
Originally I said to myself "must have gotten into an area that was just scraped or cleared of brush, and got really lucky. And there was some other guy a while back who posted about finding15 halves."
Now I realize after seeing the links to the other messages, it was the *same fellow* who posted about finding the 15 halves. And the other stuff like 1 oz silver rounds and multiple gold rings.
Once is amazingly good luck. Twice is coincidence. 3 times starts to look like a big pile of something brown with flies buzzing around.
In any event:
1. Walking liberty halves don't cause an overload signal. Even if they're on the surface.
2. If that's a copper-nickel clad Ike dollar in the other post, it's made of the same clad material as other clad coins, and should come out of the ground looking brown like they do. If it's a silver clad Ike dollar, it's not a circulation strike, it's a collectors coin, and that would mean finding 3 large non-circulation strike silver coins in one day. I've seen a 1oz silver eagle somebody found on the beach before, but 3 in a day is really pushing it.
3. Can one still find 6 silver halves in a day? Sure. Maybe once or twice in a lifetime, given the right virgin site.
And maybe 30 years ago when the parks were virgin territory, this would have been a more common occurrence.
4. Plus 7 gold rings in perfect shape with all the stones intact? For arguments sake, let's say you dig an average 1000 pulltabs for every nice solid karat gold ring (so 7000 pulltabs for 7 rings), and lets say you hunt for 8 hours. 7000/8=875. Now 3600 seconds in an hour , divided by 875 = 4.114. So that's a pulltab dug every 4 seconds for 8 hours on average. With no breaks to pee. Unless you're doing your target recovery with a bulldozer and a loam screening machine, that ain't happening.
At the end of the day, what people post is their business to some degree. But if somebody was to come into a club meeting month after month and submit stuff like that in a find-of-the-month contest, they'd be asked to leave before long.