That's why good dealers of ancient coins offer you a perpetual guarantee of authenticity or your money back, as well as an 14 days return with no questions asked. I've yet to see any dealer of modern American coins make that offer. Now, I know perpetual is not really perpetual (as the coin store will eventually one day seize to exist or the dealer and/or you will eventually die), but it gives you plenty of years to share the coin with other collectors and dealers at shows and group meetings, and get dozens of eyes and comments on it. I would never buy a coin from an ancient coins dealer who wouldn't let me look up the catalog in my phone and reference the coin he is trying to sell me against varieties, take pictures of it and measurements for my personal reference so I could research it and ask second opinions, and then if I buy it offer me a permanent guarantee of authenticity or my money back. Thankfully I've found several ancient coin sources, and a dealer in my area, who offer just that.
With all due respect, sir; I find that hard to believe. An absolute guarantee of authenticity, without expiration, is and has long been standard for any dealer of US coins worth their salt. Are there some that do not, or would claim to and then try to wiggle their way out? Of course, but the same can certainly be said of ancients dealers as well.
The fakes don't even look cameo , and I'm willing to bet it's not the pics either . Most of these bullion fakes are off and might fool someone who won't do the work of comparing to known real coins . Same as the SilverTowne rounds last year and every other I've seen on the forums . Yes you should be scared if you won't do the work of knowing what one's buying .