Welcome @Rochel Dawson, you need to start your own thread, with photos. Go to forums and select the category you want, error coins in this case, and click on New Post. Upload photos and when they are done, click on Full Image to post them full size with your post. Good luck.
I could see a Kennedy half minted on a quarter planchet, but these coins minted over other coins (and then ALWAYS ending up with the same dealer) are just too suspicious for me.
@Michael K These are not new finds. Most of the 70s San Francisco proof errors came from a sale by the State of CA after getting approval from the secret service and have been in the market for a while now. I believe that Fred Weinberg bought a lot of these during that sale. For whatever reason, they are now coming back into the market through Mike Byers.