Hi Kanchhu !

You can send a copy of  h1b receipt through fax, email, post ..whatever way is easy for you. It is required just to prove that you are a beneficiary of h1b for fiscal year 2009.

In worst case :

If ur h1b is rejected, revoked or denied, then apply for STEM 17 month extension within 10 days if u get such kind of bad news.(within 10 days is very important b'coz to apply for 17 month extension, remember that ....you must be in valid post completion OPT)