A synchronized delivery system for delivering parcels directly to an alternate delivery location such as a locker bank in lieu of making any delivery attempt at a primary delivery location such as a home or office. The system may deliver parcels directly to the alternate delivery location when a related parcel is currently stored at the alternate delivery location awaiting pickup. A related parcel may include a parcel addressed to the same consignee, to a related consignee (e.g., such as a neighbor, roommate, or spouse), or to another authorized to pick up parcels on behalf of the consignee. When delivering parcels to alternate deliver locations, the system may facilitate a grouping of related parcels in a single locker.