This is a "per user" setting. The preference file to check is this one:

defaults read /Users/ username /Library/Preferences/com.apple.systemuiserver menuExtras

If you have a script or something that's adding existing items, you'll need some logic to make sure it doesn't repeatedly add the same icons over and over. I once did it with this code:

# Get the Username of the currently logged user
loggedInUser=`python -c 'from SystemConfiguration import SCDynamicStoreCopyConsoleUser; import sys; username = (SCDynamicStoreCopyConsoleUser(None, None, None) or [None])[0]; username = [username,""][username in [u"loginwindow", None, u""]]; sys.stdout.write(username + "
");'`

# Menu bar Keychain lock screen
keyc=$( defaults read /Users/$loggedInUser/Library/Preferences/com.apple.systemuiserver menuExtras | grep -q "Keychain.menu" ; echo $? )

if [ $keyc = "1" ];
then
    # Keychain menubar app isn't running, so load it now
    open /Applications/Utilities/Keychain Access.app/Contents/Resources/Keychain.menu
fi

However these days it's probably easier to manage it with a custom config profile ;) Set it once and forget.

Thank you for the input. Here is what we have starting seeing recently.
Again, this was common the first time someone would login, but a reboot would fix it and it wouldn't be an issue again.

How are you setting the Keychain.menu to load in the first place? The cause is probably in the policy/code you're using.

I checked and there is an ongoing login policy to set the padlock via script.

It was a simple

/bin/bash

open '/Applications/Utilities/Keychain Access.app/Contents/Resources/Keychain.menu'

Could / Can this one policy cause the duplicates with the time, WiFi, Display icons as well?

Yes that's the exact cause for the keychain.menu issue. I can't vouch for the other icons however.

You can either try using the code snippet I posted above, or make the policy once per user per machine.

Oh you'll have to manually quit the duplicates or you run the risk of them continue to load.