ARe they stored in anything? If you leave them sit around for more than several days they will continue to dry out and shrivel. You can mist them well with water, cover with newspaper in a dark, cool place and hope they absorb some of the moisture. Or dip them in a bucket for a little remoisturizing, it won't hurt anything, but you've got to then get them in vermiculite or wrap in plastic pretty soon.
Good luck.