Supplement J - I140 - Employer not providing

[prem_rajesh]

I got a RFE to provide Supplement J to process my I485. 

I used AC21 and transferred my job to a new employer. Now, part of Supplement J form, I need to enter my I140 receipt number. My old employer is unwilling to provide me the I140 receipt number.

My last date to submit my supplement J form is March-28th. Please let me know what I can do now?

Planning to apply for FOIA but don't think Im going to get a response in next one week.