As I'm sure you know, the Snap Change is Edward Marlo's. He was well-known for using the sleight not only as a simple color change but also as a full-on transformation. He made business cards turn into matchboxes, etc. I believe there's footage of him changing a playing card into a coin as well. You did it very well.
The Card from Box is Matt Schulien's. Probably the most basic application of the move. I liked how you used the Tenkai rather than Classic Palm. It looked a bit cleaner that way.
Is the box clean at the end or are you left dirty with the coin still inside? If you're left dirty, I'd recommend tweaking a bit more. You can actually do this with a single signed coin if you want. I recommend looking into Richard Sander's work for an alternative to the Vox Box. He shows how to put something inside a box and make it rattle to prove it's legitimately inside. The object vanishes and the box is shown completely empty.
Looks like you use a servante. Good use of traditional modus operandi, but it's unnecessary for the effect.
You talk waaay too fast. Regardless-- you were still very entertaining. You should get some footage of you doing this for actual people. I think the forums would benefit more to see something like that posted. It'd be more refreshing to see a performance outside of a bedroom. You've a lot of energy and that should play well with a group of spectators. You remind me of Jeff Hobson.
RS.