At a glance
Count of Japan Post consignments in the last 7 days that hit a hard delivery failure: undeliverable, refused, or exhausted their redelivery / storage window without reaching the customer. Unlike a single absence (fuzai) notice, which often resolves on redelivery, these are the attempts that did not recover. The alert fires when failures exceed 2 percent of total shipments.
What it tracks
The card counts consignments whose Japan Post tracking history (追跡サービス) ends in a hard-failure status rather than a delivered scan: addressee refused, address undeliverable, prohibited-item detained, or repeated absence (fuzai) attempts that ran past the holding window and could not be completed. It is the hard-failure subset of Exception Rate: an exception is any diversion from the normal path, a failed delivery is one that never recovered. Most of these parcels go on to Returned to Sender, and the damaged or lost ones feed Open Claims. The dominant Japanese driver is unresolved fuzai, so the upstream fix is the same as for exceptions: push delivery-time-slot selection, convenience-store pickup (コンビニ受取), and locker (はこぽす) options at checkout, plus tighten address validation to cut the undeliverable tail. The>2% of total alert on a 7-day window makes this sensitive enough to catch a bad lane or a data-quality regression quickly.