回复：I765表补材料问题：yellow cover letter 究竟是什么？谢谢！(Z

I got the letter for "more evidence and information" on I-765 application last week.The cover page is yellow color.
On this yellow page there are:
1. the officer's number
2. the receipt number of your application, i.e. SRC06....
3. the mailling address for submit this REF (a diffrent mail box).