I never sort at the yard. From time to time a bigger piece of alum may get thrown in the back of the truck on a shred run (thanks to my neighbors kid, who struggles to identify metals) and i'll throw it on the side to bring back home...but even if I pick up a truckload of stuff, and something that needs to be broken down winds up buried under shred, i'll unload the truck in my driveway to get the item out.