bega cheese ceo maurice van ryn has pleaded guilty to 12 sex offences .
10 boys and girls , aged eight to 16 , have been abused over the last decade .
his wife louise is concerned for her safety after letterbox was firebombed .
she has also received threatening phone calls .
she altered freeze order in court on thursday , she can now sell their home .
earlier this week one of maurice 's victims read her impact statement .
she told sydney district court on monday she felt scared and ashamed .
` i did n't know it was against the law , ' the victim said .