Tracking silence is the most common source of shipping anxiety and the least reliable signal of an actual problem. There are four points in a Korea to US journey where several days of nothing is completely normal, and knowing them saves a lot of unnecessary worry.
The normal silences
After handover to the airline in Korea, tracking often shows nothing for 24 to 72 hours while the shipment is consolidated and flown. During customs processing, gaps of two to four days are routine. At the transfer from the international carrier to a domestic delivery partner, one to two days of silence is standard. And postal shipments frequently show nothing at all for the entire international leg.
The gaps that mean something
Nothing for seven or more days after an accepted status in Korea suggests the shipment never actually moved. Nothing for five days after a customs status suggests a hold that generated a request nobody answered. Nothing for four days after a failed delivery attempt suggests it has entered a return process. These are the three worth acting on.
Where to look before contacting anyone
Check the tracking on the destination carrier's own site as well as the origin carrier's, since handoffs frequently update one system and not the other. Check the email address on the shipment for a documentation request. And confirm the tracking number itself, since a shipment can be assigned a new number at handoff and the old one simply stops updating forever.
How to escalate usefully
Contact the party that booked the shipment rather than the destination carrier, since they hold the contract and can open a trace. Provide the tracking number, the dispatch date and the last status. A trace typically takes three to five business days for a commercial carrier and considerably longer for postal shipments, so open it as soon as the gap is genuinely abnormal.
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Start a buy-for-me order →Frequently asked
Does a stuck tracking number mean the package is lost?
Rarely. The overwhelming majority of silent periods resolve on their own. Genuine loss is uncommon and usually shows a definite failure status rather than silence.
How long before a package is officially lost?
Carriers generally will not declare a shipment lost until 15 to 30 days past the expected delivery, and postal services can take considerably longer. Insurance claims usually cannot be filed before that point.
Should I contact customs directly?
Not for a routine gap. The carrier or broker is the party with visibility into the entry and is the correct point of contact.