There are currently a lot of fake silver coins making the rounds on Craigslist and Ebay. Most risky buys are uncirculated U.S. silver dollars (circulated are OK) and 1 oz silver bullion rounds. If buying used, it is best to buy from a seller with uniformly positive feedback and to pay with a credit card so that the transaction can be reversed directly. If buying new, there is no reason not to go straight to APMEX or a similar mint and purchase silver rounds from them. If you join their mailing list and wait for specials, you can get rounds for as cheap as $0.99 over the spot price of silver.
If you have bought something that you are suspicious of, here are all the tests I know of that you can use to make up your mind to send it back or not.
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