I totally agree with Homebody's post above. I don't do bioactive (& never will), but I've read others that do, & they have taken MUCH longer to establish them before adding a snake.
And IMO, any new snake needs to essentially be in your "ICU" (Intensive Care Unit) for a while anyway. When you get a snake at an expo, they've been exposed to all sorts of stuff, even if they didn't arrive there with it, and the stress of being rehomed works against their immune system in much the same way that stress impairs our own. So "job one" is being low-key, letting them rest & eat & be warm without handling or exposure to vastly different environments. If you do this, they're more likely to remain healthy- but no guarantee, there's always a risk. I hope he shakes his RI.