If you could have it yourself - 回複：這樣啊 我跟你不會是同一個學校吧？我覺得這樣很麻煩呢

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.