traveled safely to Nepal from USA, now planning to return back to USA for few months, hopefully it will get extended

What documents do we need to show the immigration agent in airport while leaving Nepal and arriving in usa as someone who has AP (advance parole) travel document & passport, however, I have not found my TPS approval document, will they ask for it...

If so, how do we get a copy of TPS approval document and how to get it.

Thanks in advance