Hi,   I lost my I-797 original copy however I do have a valid visa stamp on my passport and I also have a duplicate copy of my I-797. Is it safe for me to travel outside the country and return back? I have never been asked for the 797 when returning back but my lawyers tell me that I need to have the original with me. Also, if I do travel without the original, can they deny me entry into the country? I plan to apply for a duplicate 797 but apparently that will take 4-6 months.   -S