Plugin with missing files

I've a plugin that contains 4 .wav files, and I've to bind a key to execute a command and hear that sounds.

For example:
bind P +xxx and it executes a command like "say_team Kill the wabbits! Kill the wabbits!" and you can hear the sound at the same time.

Since I've only 1 .wav file, I need to replace the other 3, but how do I do that?

If I just rename or copy & paste similar sounds to my sound folder, it won't work obviously, but I did that, and sometimes the command works "say_team bla bla bla" and I can see it, and the sound file (.wav) that I replace, I can hear always.

Basically I can hear the sound always, but I can't see the command sometimes.

This is the message that appear when I use the command:


I'm afraid that to replace the files the plugin code has to be modified.

Any sugestions/solutions?