it is just a first class letter. USCIS never worry about the letter get lost, because it will be your problem if it happened, instead of theirs.
It should be in your mailbox when you come back from China.
good luck.
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回复:回复:回复:是绿了, GXGX!
-想回国123-
♂
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07/18/2008 postreply
19:32:43
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回复:回复:回复:是绿了, GXGX!
-想回国123-
♂
(7 bytes)
()
07/18/2008 postreply
19:33:26