It happened that I lost my Green Card somewhere, and I have filed the I-90, an application to replace PR Card. Last week I went to uscis office for photo and finger printing. The officer there was telling me that it could take up to one year to issue the replacement. On the other hand, I have to travel outside the US next week. My question is, can I use the receipt from USCIS and a copy of my old GC as a proof that I am a legal PR to enter US? or I can't travel anywhere until my GC replacement is issued? or ? anybody had had experience the similar thing? please share.