Miles is the only one I know of that has had success. Take a look at this link to his journal myrmecocystus He stopped writing on it, so I don't know of any updates. Hence it is in the archives for the present time.
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I did keep a colony of Myrmecocystus mimicus for just over a year. The queen raised several workers but none ever became repletes. The supplier I got my queen from has now ceased trading live ants sadly, as he did import several species from a legal collector in Arizona.