Thanks for the reply. I did not see any clad stamps on the rounds. They seemed pretty legit. Would it be harder to sell these types of rounds in the future?
Yes, in general the less "known" something is, the harder it is to sell.
For example, I could silver-plate some copper blanks and stamp .999 fine silver into them, without scraping off the plating or doing other tests, it would be impossible for them to know. Indeed I could melt down some Canadian 80% silver and put it into a bar and stamp .999 fine silver on it.
The big benefits of coins when compared to rounds is that its pretty easy to tell that something is "off" on a coin. Its really hard to make a good copy of an Eagle, even out of pure silver because duplicating such tiny details is very hard without very expensive equipment and many, many hours.
Historically, aside from the pre-new world times (silver was a lot scarcer back when you didn't have the vast silver mines in the Americas and a lack of trading to Asia/Africa) silver has only really been counterfeited when it comes to coins due to its low value. Sure, you'll see silverplated jewellery stamped .925 every now and then, but there was little financial incentive to fake silver. Now, with higher silver prices, it has become more economical to try to fake silver.
Now, usually by "harder to sell" it doesn't mean that a coin/bullion shop won't accept it, most of the time they will, but they will pay you less for generic silver than they would something more recognized like a Philharmonic or Eagle. On the other hand, prices for generic silver is usually less when they sell it, so its really a trade-off. You can pay the extra $3 premium (well, with normal silver prices! today they're at $6 or so) on an Eagle today and possibly even get it back when you sell it at spot+$1-2. Or you can buy generic silver today at spot and sell it for spot-$1-2.
