Best not to use wallpaper, John. It will burn too easily and will attract varmints, who dwell and breed under it and eat the glue. Come out in the night, and pollute your water supply. Cause one to use poisons that are toxic to Man, beast and will lead to frustration because the varmints persist despite the poisons and will be heard, if you listen carefully, laughing at your efforts to exterminate them.
NO, better to make a bonfire of your CDEX certs, or either sell them at or near a penny each while you can. Or wait until they go PINK, and some pinky promoters find a new set of lies to TOUT the shares with.
But being uncommonly stubborn, you will likely just hold them until GABRIEL toots his saxophone.