At the very end of Season 5 Bosch sits in his house and engages what seems to be an old case file.
What is this about and how is it related to the rest of the story? The words on it, possibly names, say "Clayton, Daisy", but I can't quite make something of them. Also, the numbers don't seem to be dates rather than arbitrary LAPD file IDs or whatever.
Is this possibly related to him finding out about Chief Irving's evidence manipulation in the Borders case? Is he now starting to dig up other cases with Irving's involvement?