[Shadow Stranger]

I would not make a good teacher, explaining things is not my forte.
There are only 3 Tol files but there are 53 Bol files. For each of the three outdoor zones there is only one Tol file. For a given piece of outdoor terrain in a given zone, the default is that said terrain will be covered by the relevant Tol file. Hence any items, creatures or props occurring in that terrain will be found in the Tol file.
Exceptions to this rule only occur where there is a "building" (tower, hut, dungeon entrance...) nearby. Then and only then the place gets its own outdoor Bol file.
So Erzbette is in a hut in the second zone, the hut gets its own Bol file, (thutb.bol) where she is found. By contrast, Scanthril and colleagues are standing around in the outdoors so they are found in the Tol file.