There's no way Yahoo could hide a $250 per day fine on the balance sheets,
$250 * 365 = $91250
Yahoo's latest quarterly revenue was a little over 1.2 billion dollars[0]. A little over $90k listed under "court fees" would probably not cause anyone to blink an eye.
[0] - https://www.google.com/finance?q=NASDAQ:YHOO&fstype=ii