This situation not only appears in Dayun Express, but also in almost all express delivery. You can check whether the package is intact first, and it doesn't matter if you sign it first and then inspect it. After signing, tell the courier to wait a moment and have a look at the goods. If there is a problem, just ask the courier to testify for you. It's okay. Also, if you often shop online, you'd better not fall out with the courier. I fell out with the courier last time (because the courier didn't deliver the goods for two days, so I called him and he was still fierce, so I complained to him). Since then, every time I send a courier, he deliberately delivers it late ... unless you don't need this courier anymore, don't fall out with the courier.