They're still refundable, because the shows were cancelled.  Or at least,
they should be, and they are according to Creed.com.  From the e-mail they
sent out: "All tickets for these performances can be refunded at point of
purchase."  They probably won't be good for future shows, since it's a
cancellation and not a postponement.  (When the DOTN show I was supposed to
go to back in 1998 was cancelled, I took the tickets back to the
Ticketmaster outlet I bought them at, and had my money refunded to me - but
the 2000 Creed show that was postponed, the original tickets were honored,
and a refund wasn't offered).