You can do this simply and compactly with File::Find::Rule

use File::Find::Rule;

my @files = find(
  file =>
  name => 'kn',
  grep => qr/10450676/,
  in   => [ glob('nc05*/') ]
);
[download]

Check out the File::Find::Rule docs for more info on this fantabulous module.
HTH

_________
broquaint