Some USCIS adjudication officers at local District Offices are apparently beginning to request copies of Forms I-9 from applicants who are applying for their Green Cards, via the process known as “adjustment of status” (from non-immigrant to permanent resident).
The instruction letters sent out by the USCIS (to the clients whose interview appointments at the local offices are being scheduled), are still silent on this new request.
Be prepared and provide copies of any previous (at least the most recent) I-9 forms to confirm that no prior claim of U.S. citizenship or of LPR status has previously been made. Discuss this with your lawyer, well in advance of the actual interview, preferrably early on in the process.
If a social security number was used and disclosed on the I-9, you should expect questions as to the origin and legitimacy of the number.