Worked for Company 'A' on CPT/OPT for more than a year. Company 'A' filed h1b. Before h1b got approved, contract ended with client associated with Company 'A' . 

Through Email, Company 'A' said I am no more associated with them anymore and I am good to join other company. Will get my last paycheck through company A on 1/11/2013. 

However, on 1/7/2013 h1b approved. 

Got offer from company B on 1/9/2013. 

Can I transfer my h1b to company B now.? 

Will last 3 paystubs (on CPT - from dec 2012 till 1/11/2013, (i used to be paid semi-monthly)) from Company A  before h1b was approved will work or must have paystubs on h1 status with Company A which is now not possible as I am no more associated with Company A. 

Relevant answer will be highly appreciated. 

Thank you very much