Many fakes will be attracted to a tiny rare earth magnet, but I've seen some good fakes that had no effect on a magnet. So I'm thinking that maybe to make sure you should recheck them all for specific gravity. :| Let us know how you go? Maybe next time you buy gold and you'll only have 7oz to check.
Its this one: http://www.amazon.com/gp/product/B001KV38ES/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1
Melt test is most accurate. It's easy, simply determine the mass of each individual coin, set your furnace to the temperature of the melting point of silver, and time the melt of each coin. If a few are fake, the melt time will be off. If all are fake, the melt time of all will be off. It worked for me with a questionable 1893 S Morgan Dollar which was in BU condition. As it turns out, the melt test proved it was the real thing. .
This is some funny stuff. I can't find one friend to enjoy, discuss, and follow silver. Thankfully, this group enjoys a common interest and does it in a very funny way. Even the OP has been a crack up throughout this thread. Thanks for the laughs.
I believe a sense of humor is a prerequisite for becoming a stacker/collector, given the schizophrenic action in spot price over the years & decades. It's a valuable coping mechanism, really. Anyway, if the OP has any rare/expensive slabbed numismatics, he might want to crack them open for various testing, as well..
This Machine Destroys Everything (Impossible) [youtube]http://www.youtube.com/watch?v=ibEdgQJEdTA[/youtube]
Agreed, there are some members here who I very much enjoy reading their comments and whose posts have cracked me up. There are others who are jerks most of the time (sadly, many of them are long time members) and they diminish the quality of a forum...that's to be expected in every forum though and you just accept that it boils down to taking the good with the bad. .