Don't worry about the egg blowing up, we had a cracked emu egg on the back deck for a month or longer. I asked my wife why she kept it and she didn't have a reason. I asked her to get rid of it before it got any worse. A few weeks later I went to cut the back yard and found it in the grass, she had just tossed it over the rail and figured it would break and just go away, I moved it and when I finished the grass I took it to the garage to drill a couple of holes and blow it out and just save the shell. These shells are very hard, kinda like tempered masonite, well the egg imploded, smelled worse than any skunk I've ever encountered. Washed up with the garden hose before I was allowed inside.
We have had emus for a while and get a few eggs every spring. If you want to save the shells drill a 1/4" hole in each end, use as little presure on the drill as possible as too much force will chunk a bigger piece out of the shell than you will like. I then open up a large paper clip into a "L" with the foot of the L about 1" in length. Chuck the verticle portion of the clip in a drill that can be ran at a low rpm. Insert the foot of the L in the egg to break up the yoke with the clip spining only fast enough to do the job. I then place my lips over one of the holes and blow the contents out the other hole into a clean container.
Emus do not make good pets!!!