回复：请问labor certificate 申请已久, 得到case number可以在网上

You can send an e-mail to the appropriate Backlog Center explaining the need for the H-1B extension and requesting verification that their application is pending at the Center. The email addresses are [e-mail] for the Dallas Center and [e-mail] for the Philadelphia Center. Include in this request all pertinent information (employer name and address, alien name and address, date of filing, state where filed, case number, if known).

THey will give tou a screen shot for the status of your case.