I think that the clad ones are most likely to show up in rolls because they look like normal half dollars. The gold ones say "3/4 ounces .9999 fine gold" on them so those will not show up unless someone can't read. The silver ones are likely, but I think they look too "different" from the regular coins to be accepted by a cashier who does not know anything about coins.
I found one 2014 clad despite the fact I've searched only 14 boxes this year. I hope to search about 10 more boxes before year-end while on vacation over Christmas
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