No such thing. Verified Confederacy stuff is worth loads of money. There is of course lots of old stuff that people try to connect to the War of the Rebellion that isn't authentic, and lots of stuff that was made later mostly as commemorative that is worthless.
When I was a curator at a museum in the former Confederacy, many people would bring in Confederate Money for me to identify. I usually told them two things: first, even the cheap paper used in centennial reprints was better than the stuff the Confederacy had to print money on, and second the word "copy" did not appear on the original bills (while pointing to the lower right corner of the back of their family heirloom).