i want to know you send things in Africa from china, thank you.

I dispatched 5 parcels from China to Pakisan in June July and recently after a wait of 6 months receive just one parcel. I dispatched in a box and receive my things in a sack. Almost 20% of the things are missing from the parcel. Now who is responsible for the loss? I think due to the large duration of time the box got damaged and the cargo officials have transffered the things to a sack. Same is the case with one of my friend. She got 3 parcels and many things are missing due to transfer from box into sack. Now who will compensate for the lost things or is there any possibility that we get back those lost things?? Please tell china post not to transfer things in sack instead transfer the box into sack. Please please do not open the box. There are many small and expensive things in the box.

I am planning to send 2 large boxes of used clothes to the US by surface this week. I have several questions.
1. Can I go get a box from China Post and package the things at home?
2. Can I also pick up the form I should fill out to send the package?
3. I read that a China Post worker can come to my apartment to pick up the package. Do I pay the worker for the cost to send the package?
4. Can I pay with wechat or alipay or should I have paper money?
5. After the worker takes the package, is there anything else I need to do?
6. I read the list of items I can not send. Is there any other important things for having a worker pick up the package from my apartment?
Thank you for your help.