On my last trip to SDQ I showed the ticket agent my Residence Card for identifiction I went upstairs for a departing Nathans Hot Dog. I noticed I had dropped my Residenc Card at the counter and recovered it. After leaving the upstairsm bottom ot the stairs I notice3d I did not have ny cad again. I scoured the upstairs, to no avail. I am wondering if there is a lost and found at the airport. I sure like to kow if anyone knows of this office, surely nothing can be gained by keeping a Resident Card!!!