Hello Mr Arora,
I am a Hungarian citizen. I have lived in the US for 10 years and received my permanent green card in 2004. As life turned, I moved back to Hungary to take a CEO position at a company. I got a fix term, 5 year employment contract. On my lawyer's advice I have asked for a leave(I do not remember the exact name of the document). It is a green colored "travel document", which was good for 2 years. Once it expired, I applied for an extension, which I received. It expired this past September. In the meantime, the company I managed was bought up and I am not working there anymore. Now I would like to go back to the US for the holidays and the question came up - what is my status? Should I surrender my permanent residency to avoid complications at the border?(Hungary has a visa vaiver program with the US).

