waiting for h1b transfer receipt

h1transfer_123

New Member
I have a H1 with company A. Company B filed for my transfer on 27th Jul 2007. I received a e-mail from them saying that the petetion has been filed with a USCIS service center and that I can expect the receipt in 2-3 weeks. I have to join ompany B on 6th Aug 2007. Can I start working for company B without the receipt from USCIS?
Will there be any problem is company A cancels my H1 after 27th July and before I receive the receiipt ?
Please help !!!!
 
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