Um, where? Not in the server info - I checked. It is not at the end of the command line either, it is right after the +set dedicated 2.
If you do it wrongfully it can be downloaded with the console_mp.log file. <- works usually on almost every 2nd server.
So you do it wise when you set the rconpassword before logging gets activated <- happens in server.cfg usually.
so the set rcon_password commandline option have to be before an exec server.cfg
I have no longer such issues anyway. The possibility to download any file from server is a huge security exploit (directory traverse). So you can from Windows-Servers for example download the backup-registry and so on.