I take transformers and the little micro limit switches from microwaves every chance I get. If I see one sitting by the side of the road I stop and get it. It drives my wife nuts. She says "oh my God, not again" and hides her face while I do it, even if we're 50mi from home, as if someone she knows will recognize her and she'll forever be know as the woman who is married to a dumpster diver. I find it entertaining.
Last month we were coming home from somewhere and my next door neighbor had a big stovetop range microwave sitting out by the road. She turns to me and says "NO. Absolutely not!" I let her have her way. I let it stay where it was. Until just before midnight when I went out for a smoke and brought the hand truck with me. In the morning she took the kids to school, (noticed the microwave missing) I and went to my shop to take it apart. I opened it up to find that it's one of the newer inverter types with no useful transformer. I salvaged the limit switches, power cord, and stove exhaust fan, and after she got home and went in the house I wheeled it back over to the neighbor's lawn and put it right back where I got it. She left the house around lunch time and saw the missing microwave, right back where it used to be. She calls me and... well I think you can see where this is going. It took a while for her to accept that nobody had seen me do that.
FYI microwave transformers are very handy to have, for any electrical/ electronic project you might have. They are very easy to re-wind for any voltage you need.