How long have you had him ??
Some snakes take a week or even longer to settle in . Some will be ultra active in that time , some will hide away for a week .....
I wouldn't worry too much .. The Royals that are kept in a plastic tub with a hide and a little bowl of water ( some are kept like that !) are described by their owners as 'pet rocks' as they hide away and don't do anything !! ( somehow overlooking the fact that there is nothing for them to actually do !!
That's an extreme example but many do describe them as boring and yet if you ( as you have ) put some vines or branches in their vivs they will happily climb and explore for hours in the evenings .
I have a few that are also alert if not active during the day as well ..
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