I have to admit, statements like this cause some concern. You may be an experienced numismatist, but I assume you are relatively new to the coin world. If I may be so bold as to make a suggestion, why not post a picture, obverse and reverse, of one of your coins? That way members can look at it and try to determine if it actually is an error. The reason I say this is that if you're looking at coin pictures online, chances are they may not be pictures of genuine errors, depending on who posted the picture. There is probably as much or more false information on the internet as there is true, especially when it comes to error coins.
Edited to add. The picture of the capped die cent wasn't showing up when I posted the above reply. That definitely is a genuine error. My apologies to the OP. Still, you might want to post a picture of yours, just to be sure.