Mister XY immigrates into USA and gets his Green Card which is valid for ten years and which after these 10 years can be renewed.
After getting his Green Card he leaves USA and lives abroad for four years.
During these four years he enters USA successfully with his Green Card two times and he stays in USA just for a few weeks during the two stays. He didn't get any problems entering USA with his Green Card because he has not been questioned at PoE.
After four years of having a Green Card he returns to USA and stays there for two years.
Then he leaves USA again and stays abroad for two years.
Now he wants to return to USA with his Green Card again. This time, however, he intends to stay in USA forever.
As it would be his first post-9/11 trip to USA, he has fears that the officers at the PoE could find out that he has not lived in USA in the past years. He didn't even file taxes because he did not work in any country of this world.
His friend who was in exactly the same situation did the same and he could enter USA without any problems and without being questioned.
Mister XY wants to find out whether something is written in PoE-officer's computer about him and his Green Card before he returns into USA.
If it is clean, then he will risk entering USA with his Green Card because he has a valid US Driver's License, bank account in USA, Shopping Cards etc.
Where and how can he find out whether his Green Card is still valid? Should he hire a private detective?
What will happen if he gets caught? Will he be allowed to enter USA as a tourist if not as a permanent resident? He has citizenship of a country where people don't need to apply for a tourist visa, that means, they can enter USA with their just passport.
I have told him that this is risky, but he says that he loves America and he wants to live there forever now. (He used to be a student until recently. Therefore he stayed abroad most of the time since he got his Green Card.)
Could anyone of you answer the one question raised here in this posting? Thank you.