That moment when you realized that keeping old, unused files actually helps

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Seriously though, thank you so much; I'll be sure to hold on to this.
However, I took a look at it, and, as it was shown in the .rmf, the cof_updatekeypad is used to target the sicksimon model, which has chest nums (numbers on the model) which determines the code.
My question is, can this be done without using a env_model? Or, if I have to use an env_model, how could I modify, say, the generic_note.mdl to determine the code?
Hope I'm not asking too many questions; thanks for the help.