question

Vec3 globalLoc1 = token.slot.as(Storage.Slot).storageObject.location;

This is the same as writing

Object Rack = token.slot.as(Storage.Slot).storageObject;
Vec3 globalLoc1 = Rack.location;

and returns the location of the storage object the slot is in. To get the position of the slot use the "getLocation()" method on the slot itself. Note that this will return the coordinates in the reference frame of the storage object, so you have to project from there to the model to get the global coordinates.
(You can write it all in one line, but because the slot reference is needed twice this would be rather lengthy, so I opted to create a "slot" variable.)

Storage.Slot slot = token.slot;
Vec3 globalLoc1 = slot.getLocation(0.5, 0.5, 0.5).project(slot.storageObject, model());