I keep all of mine and cut both ends out and flatten them as I use them. I mix them in with my shredder tin and it usually adds about 200 lbs to my load. Not worth a whole lot but it takes pretty much no effort to keep them either. If it's steel, I throw it in a box to go with what ever load of low grade I haul next (even the caps to the beers I drink).
I know some yards get them to recover the tin, the yellowish tint they have (gray ones are tin free steel) and pay more for them but I've never lived near a yard that did this. Your city is selling them to someone who does. Tin is a fairly valuable metal but you can only find it as plating.
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