Check out the pics a little down the page of this person's anerys. These look to be adult animals and you can see that they too have "browned out" some. As in BPs, boas tend to develop brown on their bodies as they age, so you're seeing some browning on your adults. With anerys, to me, it's most evident that the "warm" orangy / redish tones are missing. The babies will look like shades of grey and gain brown as they age, but don't have the red or orange tones you'd see in a normal. It may be that very high end anerys stay grayer (the same is true in BPs), but it can also be random as to how much brown they develop.
Whether they are anery or not, they are definitely nice looking boas.
You might want to try asking here. The link is to a boa-specific forum and there might be more people there that have bred anerys and can tell you or show you pics of their adults. That forum doesn't get as much traffic as this one, but the people there have been helpful to me.
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