USPS parcel select delivery time within Bay Shore area New York US

Parcel was posted via USPS Parcel Select service on the 2 September 2017 in Bay Shore New York and delivered to the recipients mailbox within the Bay Shore New York address on the 5 September 2017 which took about 3 days delivery time - that's quite slow for delivery within the same area. Below is the tracking info from USPS

Tracking Number: 9261299995994722482963

Delivered
On Time
Updated Delivery Day: Tuesday, September 5, 2017
Product & Tracking Information

See Available Actions
Postal Product:
Parcel Select
Features:
USPS Tracking®

DATE & TIME STATUS OF ITEM LOCATION
September 5, 2017, 5:37 pm Delivered, In/At Mailbox BAY SHORE, NY 11706
Your item was delivered in or at the mailbox at 5:37 pm on September 5, 2017 in BAY SHORE, NY 11706.
September 5, 2017, 9:20 am Out for Delivery BAY SHORE, NY 11706
September 5, 2017, 9:10 am Sorting Complete BAY SHORE, NY 11706
September 2, 2017, 12:39 pm Arrived at Post Office BAY SHORE, NY 11706
September 2, 2017, 11:24 am Accepted at USPS Destination Facility BAY SHORE, NY 11706