How to get my approval notice of I129 and I129H for my expired H1B?

Hi,

My unused and unstamped h1b petition got expired in 2012, which was initiated by my previuos employer. Now my current employer planning to initiate a cap exempt H1b for me. But i donot have the aaproval notice of I129. I do have only the receipt number of my petition. Can anyone please guide me on what to do?

TIA.

SubKrish