Responses
This is also been my thoughts. I think Doha doesn't want Bada to find his tape and regain his memories because once he does, then Bada will remember he is an NPC and try to work hard to complete the game and Doha doesn't want that. He just wants to stay in the game with Bada.
What if Bada's tape is in that bag since it's an obvious place and Doha is just hiding it?
And I'm not sure if I remember this correctly but didn't Doha clear the mountain hut before? If he did, then he knows exactly what to do and is not even telling Bada about it.