Hihi! so sorry for taking so long to reply www,
Spoilers, of course:
.
.
.
.
.
.
.
.
.
.
.
.
the password is 6843, based on that one technique used in spy movies and that sort of stuff. The human skin naturally produces oil and dirt, so typically the first number of a passcode is the most worn out/dirty and they get progressively cleaner the more you touch the keypad since the dirt and oil gets deposited on it. hope this helped~