méiyǒu dān hào chá jiàn gǎi dìzhǐ tóusù hé lǐpéi dōu huì kùnnán hěn duō

没有单号，查件、改地址、投诉和理赔都会困难很多。

Without a tracking number, checking parcels, changing addresses, filing complaints, and handling claims will all be much more difficult.