I751 Petition to Remove Conditions has been approved. 10 year Green Card is supposed to arrive within 60 days. Wife has Expired Card with 48 month extention (through Aug. 2025) which she has been traveling with (Colombian - North Carolina) in the past couple of years with no problem. She has ticket for Colombia in one month. I have read on USCIS site whether she needs to have an I-551 stamp or not but it is not clear to me. Can she continue to travel with expired card and valid extension or does she need the I-551 stamp before another trip? Anyone with experience with this?