成績單寄送問題 - 留學

我現在有四個學校的成績單要寄送到要申請的學校
一個大學,一個研究所,另外兩間是修學分的成績單

第一個問題:
TRANSCRIPTS MUST BE MAILED BY YOUR REGISTRAR, NO EXCEPTIONS. If anything is
marked on your transcript indicating that it was issued to the student,
picked up by you, or mailed to any address other than CSDCAS, your transcript
will be rejected and you will have to send a new one. This policy is
non-negotiable.
申請系統上說請學校寄送成績單，但是還要另外放入申請系統上下載下來的表格，
所以是去各學校在彌封前把資料都一併放入後再彌封，然後再寄送???
然後寄送的話，是只要有這些彌封的信封就可以自己寄了吧?
(因為擔心學校寄送會比較慢)

第二個問題：
DO NOT ATTEMPT TO MAIL YOUR TRANSCRIPTS TO CSDCAS YOURSELF IN ONE GIANT
ENVELOPE. This renders the transcripts invalid and is an unacceptable method
for submitting transcripts to CSDCAS. Transcripts sent to CSDCAS this way
will be rejected.
申請系統上有說明不能全部放在一個大信封袋，但是我有四個信封袋，要寄的話，
會不會很容易哪個沒寄到呀?
(雖然說如果可以自己寄的話，是同時寄而且寄的地址也一樣)


請教各位了! 謝謝 ^^

--