I wouldn't worry too much about the break-in. It is very debatable as to whether speakers actually break in or not. (I can be said that it's the listener that's actually breaking in.) Regardless of whether break-in is an actual physical phenomenon or not, I would just listen to the speakers normally and not bother leaving them on at high volumes while you're out. Why waste all that good music on an empty house?

I assume you'll be keeping the speakers, right?