What should I do if the sealed package of immigration summary data is lost?

Didn't you receive all the documents? What about passports and visas? Did you get it? A sealed bag is necessary. When landing in the United States, they will give it to them at the customs and press their fingerprints to get the A number (green card number). If they didn't receive it, it may be that they sent it to others by mistake, and this will happen. Is it from Guangzhou? Ask the Consulate General of Guangzhou for it.