When my KSB escaped about 2 years ago, I found her underneath the bottom level of the rack under where the heat tape is...Might be a good place to check, also at the back of the shelf that the tub is on in the rack.
If there is any noticeable gap, don't put it past him to squeeze through. My new baby male KSB has cardboard shoved under his tub in a rack system to keep it tight fitting. I have soldered air holes into the tub to allow enough air flow, but I'm not taking risks with a snake the size of my pinky finger in width.
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