Berlioz recordings
I have never seen a boxed set of complete works for Berlioz. I have seen some multiple cd sets from Europe on cheapie labels but I ignore them normally.
Berlioz wrote several large orchestral works which are availiable from prominent orchestras and conductors and well recorded. Among them you might seek out "Symphonie Fantastique", "Requiem", "Symphonie Triomphale and Funenbre" and a set of his Overtures. He was also mildly prolific in writing several operas.
I hope that this might help you on your search!
