Not sure about the Bo105 specifically but Manufacturers normally install Chord-wise Blade Weights on the front of, or inside, Blade Spars before Release To Service. Those fitted in the Blade Tips are normally for Dynamic Rotor Balancing. It is 'unusual' for maintenance companies to meddle with Chord weights.
Some larger Blades (e.g Huey/Chinook) do/did have 'forward' Tip Weights independant of other Tip Weights.