Every situation is different. Some get more dried out, more stuck than others. OP can attempt a partial zip and wait some more. I'm not hopeful that that would help though because they've already removed part of the shell, and the chick has not taken advantage of that and has not attempted zipping, that's why I'm thinking it might be too stuck to move at this point.That wasn't my experience with a shrink wrapped chick. I still allowed her to push out once I did the left to right chip while checking the membrane.