In the US these days, I'm afraid that by the time you get through immigration, which is no fault of the officials there, your bags will have long ago come up on the carousel and will have been taken off and dumped somewhere. I have no idea how long before the bags are carted off to a storage depot but if the queues at immigration get much longer, it'll happen. Last week at JFK at 16.30 landing, it took two hours to get through passport control. This is not that onerous but finding your bag in a depot somewhere would be.