Read the following article and answer the question.

This evening I am going through boxes of old letters my Mom saved . I mailed the boxes to myself when I was cleaning out her house about a year and a half ago . There was so much shredding I had to do and she had saved everything .

What may have been the reason the narrator mailed boxes of old letters to herself from her mom 's house ?
Her mother had passed away so she was putting the house up for sale .