"Document Was Mailed To me" i485

Hello guy’s, today i received this update in my i485 :

1)February 11, 2022 The Post Office returned a notice we sent you for your Form I-485, Application to Register Permanent Residence or Adjust Status, because they could not deliver it.

Almost hour after, received this:

2)February 11, 2022 Document Was Mailed To Me

Someone know what this “document” means ?

Thank you!!

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