H1B Transfer - X->Y->Z employer

[Aryanathan]

I recently joined from X to Y employer on receipt notice. Unfortunately, after joining in few weeks I got my Y employer H1B transfer status as RFE.

Due to some problems I would like to move to Z employer now, 

For Z employer transfer,

Do I need to submit X approved docs and payslips(which are two months old)?

or

Do I need to submit X approved docs and Y employer payslips(which are recent, but not approved status )?

or

Is there any other approach, I need to follow?

Note: I requested X employer not to revert my H1B status till Y employer status is approved. X accepted my request as well not to revert.

 

[gopalakrishnach]

I believe employer Z must work with an immigration lawyer and they will tell you the list of documents you need from X. I always make copy of my paystubs and timesheets.