Why consignments get held
A hold is not an accusation. It is a request for information that the file does not contain. The reasons below account for most of them, and all of them are avoidable at booking stage.
The description is too vague. A commercial invoice saying apparel or promotional goods forces the broker to guess a classification. The description needs to name the product type, the construction and the fibre or material, because those three facts drive the classification. This is the most common cause of a hold and the easiest to prevent.
The invoice is missing or incomplete. No buyer entity, no address, no value, no delivery term. A courier parcel arriving with an invoice that is a photograph of a shopping list cannot be cleared, and the parcel will be returned rather than released once a deadline passes.
The values do not reconcile. The invoice total, the packing list quantity and the customs entry disagree. Often the difference is legitimate, such as freight billed separately or a discount applied, but it has to be explained on paper rather than discovered by the broker.
The goods contain a regulated item. Batteries, power banks, liquids, magnets, aerosols, electronics with lithium cells and lighters each attract their own requirements. An undeclared battery inside a gift pack is the single most common surprise at a courier hub in this category.
The origin proof is missing. The supplier declared a preferential origin verbally and the proof of origin was never produced. Without it, the consignment is assessed under ordinary rates and the importer learns about it from the duty notice.
The product needs a document nobody obtained. Certain goods require conformity or safety documentation before they may be released. Drinkware in contact with food, certain toys in a gift pack, and products aimed at children are the ones corporate buyers most often encounter by accident, because the items are chosen as gifts rather than as regulated products.
Nobody can answer the phone. The carrier needs a named contact and a working number to resolve a question, and a consignment held over an unreturned call will be charged storage it cannot recover.
Every one of these is cheap to prevent and expensive to fix from a customs area. The mitigation is not more documentation for its own sake; it is a short pre-booking conversation with the broker using a specific product list.