Looks like this plugin is broken, it still give notices in chat. Think it happend after the newest game update

Installed today. Had some issues. Replace your code with the following code to fix:

namespace Oxide.Plugins
{
    [Info("No Give Notices", "Wulf", "0.3.0")]
    [Description("Prevents F1 item giving notices from showing in the chat")]
    class NoGiveNotices : RustPlugin
    {
        private object OnServerMessage(string message, string name)
        {
            Puts($"OnServerMessage called with message: {message}, name: {name}");
            if (message.Contains("gave") && name == "SERVER")
            {
                return true;
            }

            return null;
        }
    }
}