Peggy,
This is for what its worth (fwiw). A number of years ago there was a short thread on this site that those Sam Boyd coins have a .999 silver notation and then again some don't. My interpretation from that thread was that if there was no notation of .999 silver then those coins were clad. I had a number of those coins at that time and some were noted and some not. I sold all of mine to the coin dealer who previously had sold them to me, this was when silver was appreciating in price. Again, fwiw. I think I recall that Dennis had input on that thread but am not positive on that.
Regards, GeorgeL