The Williams logo is trademarked so you really can't sell a replacement without licensing it, but as it's just for personal home use you can make your own pretty easily.
I have one of those Cricut/Silhouette craft/vinyl cutters so I just pulled up a copy of the logo, fiddled a bit in the software to make sure it would cut in the right places, and loaded in some gold vinyl.
It's essentially just a sticker, but I really like how it came out. That blank space on the box really stood out before and looked like something was missing from it.
I'll try to post some pictures when I get home tonight