Buuuuut, if you put a copyright disclaimer in said box, then you'd have a lot more ability to argue that the work is yours when dealing with eBay and whatnot.
I couldn't care less if folks here were to erase a copyright notice on my work if it were for their personal use. Hell, I'd help them do it if they couldn't do it on their own. But I have never, and won't ever, license any of this work for profit.