if this is an immigrant visa for CR1/IR1, on the AIS website you can view the tracking number on the first page once you sign in. Its called "Courier-In Shipping Number".
We sent our passport back in August, 15, and took a month for them to reply and confirm they recieved our "documents", even though we were bugging them about any other documents (ex. medical and passport photos). Only for the consulate to request additional documents 2 months after intially requesting the passport. For reference: passport photos were submitted on Oct 13 and medical exam sent to consulate today, although completed almost 2 weeks ago .
So my trust in consulate responses is not 100% as they just use templated cookie-cutter responses for all, especially if they already responded to you. Its likely your documents were delivered and just pending consular review. I would wait another week and get your congress to send an inquiry as to the status of the case and if there is any other pending items.