[semlar]

You should only need something like this..

WarforgedSeal:SetScript("OnEvent", function(self)
    local name, count, texture = GetCurrencyInfo(776)
    self.obj.text = count or "0"
end)

You can get the currency id from the wowhead url for it, timeless coins are 777.

Also you have a typo (presumably) with "WarforgedSeals.obj", the S on the end should likely not be there.