Many Taiwanese companies have had the experience that their containers have definitely arrived in some mainland port, but they cannot find their goods. Or, that they have products they must urgently ship, but they are held up because of some inexplicable customs regulation or unforeseen circumstance.
很多台商都有經驗，貨櫃明明進了大陸某一港口，卻遍地找不到貨品，不然就是急著出貨的產品，因海關莫名的規定或意外狀況而受阻。