The since is set in a kitchen of Downton Abbey, where there are the working staff who are having a braek during teatime. A man, probably the butler, gives to the staff their post except that a woman. So she asks to Mrs Carson (the butler) if there are post for her, but he said no.

The second since is set in a prison, where a man is giving the prisoners their post, but a prisoner hasn’t been giving any letter. So he is feeling sad.