US Immigration from Myanmar

My wife has been in Burma (Myanmar) for three months now. She has a green card because she immigrated with me last year. We waited in her (now our) son to get done with the school year before allowing him to join us. He just got his IR2 visa issued, and they will pick up his passport tomorrow. The next day they will fly into LAX. I have never arrived internationally via LAX, although I have done so many times in SFO.

I am trying to create a map and email it to my wife.

They will arrive to terminal 8. Where must they go for his immigration process? It is not shown on the official web site map.

When my wife was issued her IR1 visa last year, we waited two months because the Embassy had misplaced her passport. I called my senators' office, and about two days later they located it, and called her to come get it. The date of issue on the Visa was June, but they returned her passport in August.

Once my wife settled in the USA we petitioned our (her) son. Things went amazingly fast though USCIS, and the NVC ( I think it helped to include my DD-214 so they knew I am a Veteran). The embassy has stalled us three months now, First was about getting the biological father's permission. We had included his death certificate. I would have thought that was good enough. Well, for some reason they needed to check with his paternal grandparents. They of course had no problem with their grand child immigrating from their war torn country to the USA.

The visa status has changed to "issued". Where have we seen that before? The embassy called my wife, and asked for his passport. They have the passport. The situation has repeated itself. I am a bit worried because they also have my California birth certificate, our marriage certificate, his birth certificate, and a lot of other documents that might also be misplaced.

The interview was last February. My wife flew back to attend it with him. She has been there almost three months. I have already contacted the senator's office again. What else can I do?