Are you suggesting that the words Seventeen Days were significant to Casey on July 9? Like the actual last time she saw Caylee was 17 days prior to July 9? It does seem like she was counting the days - on July 15 she said she had not seen Caylee for 31 days. But 17 + 6 = 23, not 31.
The hit songs from this album were "Let me go" and "Behind those eyes." The album was released in 2005 and then again in 2007.
The "Let me go" video has a very intriguing storyline in light of casey being a single mom which is summarized here:
http://en.wikipedia.org/wiki/Let_Me_Go_(3_Doors_Down_song)
and the lyrics to "Behind those eyes" could be seen as compatible with the storyline of "Let me go"
http://www.lyrics007.com/3 Doors Down Lyrics/Behind Those Eyes Lyrics.html