Usage patterns
〈人〉に小包を送るto send a parcel to someone
I sent a parcel to my parents in the countryside.
小包が届くa parcel arrives
The parcel I ordered arrived yesterday.
小包を受け取るto receive a parcel
I picked up the parcel at the post office.
小包を出すto mail a parcel
I mailed a parcel at the post office.