What's I-829? Help.

We just moved from one state to another state, and we informed CIS last week.
However, I got an e-mail this morning, saying something about I-829 form.
I really have no idea about it since we never filed I-829 form. Does anybody
know something about it?
Thanks a lot.

On (insert date I-829 filed) we sent you a notice of receipt for the Form I-829, Petition by Entrepreneur to Remove Conditions that you filed. Recently, you contacted us and informed us you did not receive that receipt notice. Enclosed, please find a duplicate receipt notice for the Form I-829. Please read the instructions on the notice. We have also updated your address based on the information you provided to us at the time of your recent inquiry.

If you have any further questions, please call the National Customer Service Center at 1-800-375-5283.

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