Bec, what list are you using that lists privately owned ATMs are 5223? Is it a list provided by your vendor?
I ask because the FinCEN list and the drop down box on the CTR don't list a separate code for Privately Owned ATM, and 5223 is listed for Activities Related to Credit Intermediation (which matches the list at NAICS.com).
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I can't herd the cats anymore, so I just set up the electric fences and let them fry when they stray out of bounds.