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ANSWER: The visa expiry is not really a problem. That is only important when trying to enter the US. What is important is the date on the entry stamp the traveler received, and whether the I-485 was field prior to the expiration of that stamp.
It sounds to me like the I-485 was field before the entry stamp expired, which is a good thing. The alien is safe because s/he is in the US in what is known as "authorized stay." That means s/he has filed an application for adjustment of status and is awaiting the result of that application.
I know these issues can be confusing. If you want to discuss this or anything else by phone, I can send you an offer for that. There will be an additional fee, if you want to do that. Please let me know and I will send you the offer.
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