I see. In the US, how that is handled depends on the local, somtimes even city government not county government, so you could literally move 30 minutes away and have entirely different rules regulations and procedures for that sort of thing. My own particular one, you just call the actual trash collectors and tell them you have a big item (like couch, etc.) and it's just taken at the usual time.
Something as small as a keyboard would just be tossed in with the normal trash. So it would be ill-advised to go around sifting through that stuff, lest you be called an identity thief.