What does it mean to send a message that there are three couriers in the rookie app and one hasn't been delivered? How can I get it?

In this case, someone may have sent you three couriers, two of which have been delivered and the other has not been delivered yet. You can track the courier information through the rookie app. Once the courier arrives at your place, you can go to the courier point to pick it up. If you want to know more about express delivery, I suggest you contact the sender or the customer service of the express delivery company and ask them the specific delivery time and express delivery information, so as not to receive the express delivery in time.