H1B transfer without pay slips

Hi,

My H4 to H1B COS was approved on Feb 13, 2015, though my petition was approved in Oct 2014. I got my SSN on Mar 15. My visa was sponsored by Company A. They were not able to find any projects for me till now. But now I have an offer from Company B and they are ready to transfer my H1B. But I do not have any pay slip from Company A.

What is the chance of my H1B transfer getting approved? Apart from pay slips, are there any other proofs that I can get from Company A like employment verification letter or something to make it work? But I initially would like to do the transfer without the knowledge of Company A.

Could you please clarify my doubts?

Thanks a lot!

In general, H1B approval (if you happen to be in H1 status in US before) needs previous paystubs. Without that, good possibility of denial