Yes, keep the grenades away from the bandoiler, the reaction creates a melting effect on the plastic over time.
Lee has a really nice boxed one of these and a few loose ones too I believe!
this was one of the first items I bought when I decided to start collecting again 2 years ago - I lucked out and managed to bag one that was practically unused with a mint box, the flap had never been folded, still remains my favourite piece.