I have to use Amazon Prime at work, and I ordered over $1,000 worth of items the day before they cut off FedEx. Most of the items were third party sellers, but a few were fulfilled by Amazon itself. All but one were shipped via USPS.
Our facility is located in a business park and uses those apt/condo mail boxes. Normally, FedEx would deliver to our warehouse, but USPS will not. All but one item was returned because there wasn’t enough lockers for all the businesses and their packages.
I’m thinking that we weren’t the only customers who had to have Amazon credit back money.