I think I'd rather take the negative feedback and add a note to it explaining what happened.
You are not mother nature and therefore, cannot control the weather. The fact that they were frozen is not your problem.
As for not marking on the box that they were hatching eggs, you did the right thing. If you would have, there was a much higher chance that they would not have reached her in tact. For some reason, marking "hatching eggs" on a box is like saying "kick me so I'll break". The postal system is infamous for that.
You are not mother nature and therefore, cannot control the weather. The fact that they were frozen is not your problem.
As for not marking on the box that they were hatching eggs, you did the right thing. If you would have, there was a much higher chance that they would not have reached her in tact. For some reason, marking "hatching eggs" on a box is like saying "kick me so I'll break". The postal system is infamous for that.