I think you'd better use US Post Service,receipt return mail.Whe

來源: xiaobaitu 於 2006-06-02 22:51:19 [] [博客] [舊帖] [給我悄悄話] 閱讀數 : (252 bytes)

CIS receive your mail,they have to stamp on the receipt
with a stamp that show the received time & date.Then the receipt will be returned to you.You will get enough
evidence to ask reopen case if your application lost
during processing period.

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