I went to the main gate of our apartment to bring the courier which we had ordered. My father, while going, said there is only one courier, so I took only one courier and came home. I said that there is one more courier there. Then my father checked and said that there is one more left. I went again to get the courier, and they said they did not check. They gave me two, and I thought both were ordered by my father, so I brought them home. But he said that we had ordered only one. Then I checked the flat number of both: one had our flat number, 312, and the other was for flat 302. I went there and gave them their courier.
We need to correct a mistake, even one that we did not do.