Responses
No, I think you may have misread that line in chapter 49. It states that Stone dropped the bag of money + cube disabling button at Pilsang's home — it didn't say that Stone used the button to drop the bag.
Besides, only Pilsang is being effectively stalked by the cubed — it wouldn't make sense to use the button when Stone is not being followed anyway.
cubes*
Rereading while waiting for the next season, just noticed in chapter 40 they concrete that the cube disabling button is one time use, he uses it for the first time in chapter 49, where it mentions at the end Stone came to his apartment discreetly by using the button, but then Pilsang uses it again of course in chapter 56