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are sufficient proof for her legal status.您说是不是就回不去了？
-Technically, it is fine to use this receipt and the expired green card to travel, but we don't know whether the Chinese Customs officer and the airlines know this kind of immigration law well. So, she may explain to the Chinese Customs officer and the airlines if she has trouble with them when she returns to US.

另外，老婆的case status一直都查不到，移民局的人也查不到，说让打那个咨询电话。这种查不到statu的情况常见吗？
-It is not normal for "移民局的人也查不到", so your spouse needs to call USCIS to see what happened.


会不会影响申请？

再次感谢