Finally Boost customer feedback replied me that those listed in their website means 100% all outlets will accept Boost, those not listed some might accept, some might not.

But then I asked them, the following still don't accept, how ah? Not sure how they going to answer me:-
- Chizu Sunway Pyramid
- La Juiceria KLCC
- Llao Llao Pavilion

I believe many more still don't accept despite being published on Boost