My friend had a similar situation and has been told by his lawyer that the Immigration law doesn't precisely states that you have to find a job within certain period of time after you start your H1B. Therefore, there are cases where people have got H1B and have started the project after few months. He was told by his lawyer that he will be fine for 3-4 month. He was also been told that if he wants to transfer his H1B to different company, he needs 2 week pay stub from A company before he can transfer to B company. Not sure about transferring before Oct 1 though.

Also, I have question: Can you continue to work on your OPT (expires on Feb. 09) even though your H1B starts from Oct. If no, then how risky is it, if you continues to work on your OPT? Any suggestion will be appreciated as one of my friend is working on his OPT for a company but is unable to get his H1B transfer to that company( due to company internal compliance policy) and wants to work with that company until he finds another job with the company that sponsored his H1B.