Inspecting raid for trinket equipped

[Arrzarr]

Afternoon all,
I've been trying to set up a weakaura that will show at a glance who has the Nathria group based trinkets equipped without having to go through inspecting the whole raid.

Below is what I've got so far, including some old variables that I haven't removed just yet.

When using this in a raid, I can tell that it's looping correctly and when i = my index, the Stone Legion Heraldry I'm wearing is detected correctly, but every other iteration of the loop returns nil.

Is that something which isn't possible with straight LUA as a guildie suggested to me or am I just missing something obvious?

Thanks,

Arrzarr.

function()
    local SLH = "SLH Users: "
    local CH = "\nCH Users: "
    local returnValue
    local equipped = false
    local raiders = GetNumGroupMembers()
    local itemID
    local index
    local name
    local names = {}
    local trinketIDs = ""
    for i = 1, MAX_RAID_MEMBERS
    do
        
        --This is inefficient but designed for readability to figure this out
        index = "raid"..i
        name = GetUnitName(index)
        
        --Check for Stone Legion Heraldry
        itemId = GetInventoryItemID(index, 13)
        if itemId == 184027 then SLH = SLH .. name .. " " end
        itemId = GetInventoryItemID(index, 14)
        if itemId == 184027 then SLH = SLH .. name .. " " end
        
        --Check for Cabalist's Hymnal
        itemId = GetInventoryItemID(index, 13)
        if itemId == 184028 then CH = CH .. name .. " " end
        itemId = GetInventoryItemID(index, 14)
        if itemId == 184028 then CH = CH .. name .. " " end
        
    end
    returnValue = SLH .. CH
    return returnValue
end