Who is responsible for unpacking the package and being damaged by the courier during delivery?

Both sides are responsible. The courier belongs to help, not his job. You should always pay attention to the whole process. You must read the text message immediately. Since you asked the courier to help unpack the package, you said there was a problem without communicating with you later. Do you have to ask for advice at every step?

This needs to be settled by both parties through consultation. Don't think about the other party's full compensation. This is almost impossible.