Every single REO is listed! Why is that?

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I've talked to a couple banks, and they referred me to their website for bank owned properties. Turns out every single property listed on their website is listed by a realtor! Why is that? Is it just a coincidence, or do they only post listed properties on their site? I'm wondering if there are a bunch more that aren't listed that they're not telling me about. Maybe the realtors are snatching them up too fast?