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^In some of those cases, it is possible that the unsold home is just being re-listed by a new agent and therefore would receive a new MLS number. For example, there has been a house sitting on my block that hasn't sold in almost a year and recently the realtor has been changed.

edit: Yeah, there has definitely been a drop in sales for sure that is quite noticeable (i.e. 30%) but homes are still selling nonetheless. There were 8 homes sitting unsold in my neighborhood for quite a while (many months if not a year) but I noticed within the last month or two, 2 of these homes are now sold.

I was also told that despite re-listings, you can still see the past history (i.e. days on market, former asking prices) but you need to be licensed to access the information on the database. So I would assume that the realtor working with the buyer would inform his/her client, which would still influence their offer. Thus, the only ones not privy to these details would possibly be buyers without their own agent.