Yep, these are all scams.  Most originate from Craig's List ads or similar services.  As soon as you post you get a poorly worded, foreign translated form msg.  asking if you still have items for sale and condition..blah blah blah.  this has happened to me many many times, every time i post an ad on Craig's List.  Just goes with the territory.  I just like messing with them and even call back and leave random msg's just to annoy them.

If you are getting these via Craig's List - try adding the words "if this ad is still up, the item is still available.  Don't call and ask if it's still available".  Also type in your phone number using partial words and not numbers - such as (234) Five Six 7 - Eight 9 1 One