Only ones used for testing. Trust that if you hit a point where it's asking for a password you either have been given the password already in some form or you're not meant to know it (yet).
Keep me posted how you find the game moving forward though!
Oh, so does that mean that Day 1, Day 2, and Day 3 do have working passwords, it's just that I have not been able to find them ?
Well, I guess I still have long ways to go. I have found every password from Day 4 onwards, and I had a great and enjoyable time doing so. Thank you for such an experience in your VN. Looking forward to Day 18. Keep up the awesome work ^-^