The servants noticed nothing, since Annie, the housemaid, who took in the coffee, brought in seven cups, not knowing that Mr. Inglethorp never drank it, whereas Dorcas, who cleared them away the following morning, found six as usual ”or strictly speaking she found five, the sixth being the one found broken in Mrs. Inglethorp's room. 
Dorcas found all seven cups in the morning including a broken one in Mrs Inglethorps room.