function onUse(player, item, fromPosition, target, toPosition, isHotkey)
    if not item:isContainer() then
        return false
    end

    local uniqueId = item:getUniqueId()
    if uniqueId == 0 then
        return false
    end

    if player:getStorageValue(uniqueId) ~= -1 then
        player:sendTextMessage(MESSAGE_INFO_DESCR, "The " .. item:getName() .. " is empty.")
        return true
    end

    local reward = item:getItem(0)
    local stackable = reward:getType():isStackable()
    local weight = reward:getWeight()
    local name = reward:getName()

    if stackable then
        if reward:getCount() > 1 then
            name = reward:getCount() .. " " .. reward:getPluralName()
        else
            name = reward:getName()
        end
    end

    if reward:getArticle():len() > 0 and reward:getCount() <= 1 then
        name = reward:getArticle() .. " " .. name
    end

    if weight > player:getFreeCapacity() then
        local term = "it is"
        if stackable and reward:getCount() > 1 then
            term = "they are"
        end
        player:sendTextMessage(MESSAGE_INFO_DESCR, string.format("You have found %s. Weighing %d.%02d oz %s too heavy.", name, weight / 100, weight % 100, term))
        return true
    end

    -- give items
    for _, item in ipairs(item:getItems()) do
        local clone = item:clone()
        if player:addItemEx(clone) ~= RETURNVALUE_NOERROR then
            clone:remove()
            return false
        end
    end

    player:sendTextMessage(MESSAGE_INFO_DESCR, "You have found " .. name .. ".")
    player:setStorageValue(uniqueId, 1)
    return true
end