The box came out great, sprueing it up should be fun.
I cleaned up about 20# of this wax and was able to filter it through some cheesecloth. I heated it on direct heat and it kind of separated. Rasper said I should use a double boiler set up, just set a pan of the wax in a pan full of boiling water. Most of the dirt is on the outside, I scraped it of and had some pretty clean chunks to work with. I cleaned up some machinable wax I got from the same guy, it came out great.