Ok first it's the exact same puzzle as the Nkryptor just a different engraving...
As for breaking it. I'm betting you did not damage it. I've had a problem or 2 putting it back together where it was slightly off and I had to use a mallet to get it fixed with no lasting damage. Just trying to slide it open with force is not going to do anything, you need to find the "trick" or "tricks" as the case may be
If you want to PM me exactly what you did or what you think is the method, I'll see what I can help with, without giving anything away.