Fannie Mae Shadow Inventory… My buyer wants to buy one of them. HELP

I am finding vacant properties all over the place that are not listed as of yet. I have a buyer that wants to make an offer on a Fannie Mae property that is just sitting there. Does anyone have any idea who I would contact, or is it a lost cause? I want to help my client. This is not the first time it has happened and it would be great to find a way to make this client happy and to help others as well. Any advise would be appreciated.

Sandra Watkins

RE/MAX Town and Country