well then what are your choices ?
A another radio
B a chunk of diamond plate
C another chunk of plastic or pack it full of Rage Gold
D your attitude as suggested above
E the head off a stuffed animal
F you could fill it with seam sealer
G expanding foam
H plexiglass
I a piece of mirror
J a handkerchief
K toilet paper
L gauges
if i come with more suggestions maybe , i will post them
as a sidenote, i was going to suggest keeping the AM radio in there myself, but i thought of some better suggestions