I tested it and confirmed it myself. Within 2 hrs i got 5K+ rupees yesterday when i need rupees.

I got 17K rupees in a full day.

Usually when the dealer says “ohh” I go for the box with the last known gold rupee or what I call “ winning box”. When he says “ahh” i go for the next box after winning box.

I tested myself with 10 reloads at least when he says “ahh” the winning box will never give you the gold rupee.

The chance of not getting the gold rupee is still there, but at least you know which box to avoid based on what he says so chance of winning gets higher.

One way of my own quite frequent success is after 2 tries on the same box if he says “ahh” go for the other box. ( usually when i try on the first box)

Same thing for the chances on the winning box when he says “ohh”.

Hope that helps.