Lovely box yet again! I love making boxes. You might be interested in a teflon bone folder since you make so many boxes and such. I know SU doesn't carry them yet but I bet in the future they will. The teflon never stains, wears out, or leaves shiny marks on the cardstock. This is just an fyi tip.
Be careful, there are some bogus sellers out there for teflon. Ellen Hutson, Simon Says Stamp, and MFT sell them, just to name a few. A man who created them has his own website, dennisruud.com but he is in the US.