You are right, I was probably thinking about the _items.ini file used to print map dots and toggle rare sound chime on/off. My bad.
At the time I made that list, Ganondorf Shield wasn't yet available and its ID wasn't in the Wiki.
He can seek an item ID by looking at the end of wiki's URL: https://www.phantasystaronline.net/forum/index.php?/wiki/item/&id=0102B4
If the ID shown on wiki is correct, it should look like this
t[ 0x0102B4 ] = { 0xFFFF0000, true } -- Ganondorf Shield
And then placed after line 1599: t[ 0x0102B3 ] = { 0xFFFF0000, true } -- Girl Scout Cookies to match the order they were added to the game.
Can also get the ID by enabling Show Item ID from Item Reader add-on. It will show the code before the item name, but he must have that item on inventory to see it.
Last time items were added to the server were the 4/20 day shields and Summer's Serene Swan, and those are already added.
I took the liberty to update the list from repo already, here you go: https://pastebin.com/uUNaJBa8