Parcels sent abroad need to go through foreign customs, and customs inspection of packages is mostly in the form of spot checks. If the customs consider your package to be quite special (such as large volume, heavy weight, or containing sensitive materials), they will generally proactively contact the recipient to provide invoices or customs clearance documents. The costs incurred in the return or destruction of the package due to the inability to contact the recipient or the recipient's lack of cooperation in actively contacting customs clearance will be borne by the recipient themselves.