it was SFO. They pulled us from the global entry and others (including cabin crew) to go through the bag checked where they opened the baggage to see what's inside. I did tell them when we went through the GE that we had some items declared and they asked the amount (which is <5k, so the person said fine no worries). But after that he said the system chose us randomly to check bags and put my husband's passport to the box to go through the bag check after we got our luggage. At the bag check, the custom guy said they are doing a random search for the entire flight - we saw many people in the line after us. And most of my purchase was not leather (just a Kelly belt and shoes but we had a 140 scarf) he told me the amount and I computed that they converted my receipt to USD and then take out family allowance and then slap a 9% duty on it (I did not bother asking for details).