If you could have it yourself - 回复：这样啊 我跟你不会是同一个学校吧？我觉得这样很麻烦呢

better have it. Otherwise, you can always "borrow" it when you need it to apply a visa overseas. I don't recall, at this moment, that you will need the original for other cases.

The approval notice is supposed to be kept by your employer who is the petitioner, as stated by pharmacyelite. You only get lower portion of the approval notice.