What type of polyps? Zoos? Zoas/palythoas? GSP? Other star polyp? Sun coral? Somethin else?
MOST polyps, especially those I listed are very hardy and can survive for a very long time in a "closed" state. My zoos are a textbook example. They suffered from a rock collapse that left them upsideown in the sand bed for anywhere up to 3 days while I was on vacation. They were closed up for a month before they finally started opening back up. Some of them went through what I can only describe as a "shedding" event just before they opened back up. Long story short, polyps can be tougher than you think so dont count them out yet.
Can you get a pic?