With our first son, we tried a suggestion from an aunt. When something didn't work he knew it was broke and could say broke. First we tried to find the 2-3 extras we had and put them away. So one day when he left it on the table once we cut off the end of the pacifier (the silicone kind) washed it well to remove any extra bits and put it back where he left it. With the end cut off it didn't provide the same sucking. For some reason he called it Powie. When he picked it back up, he tried it gave it to me telling me "Powie broke". There was quite a conversation he took it went to his room, played, returned saying powie broke...this went on all day. He took it to bed with him but by morning he knew "powie broke" and he just left it on the floor.
Our 2nd son wasn't as easy...we knew it wouldn't be so it just got 'lost' one day and I told him something like "Well it must be in your room or around the house. If you can find it you can have it back." Of course we made sure there weren't any to be found. After a few nighttime tears for a couple of days, he too got over it.