I lost fonts: Athelas and Seravek at least
I just noticed that some of my fonts are missing, notably the Athelas and Seravek font families. I don't know how long they have been gone, and I don't know how many others are missing that I can't think of.
I first noticed they were missing when I went to use them in Pages. Then I opened Font Book and searched for them using the search field and by browsing, and I don't have them.
They are not in my Trash, although it was emptied recently. I didn't intentionally delete the fonts, and it's difficult for me to imagine how I might have unintentionally deleted them.
I want to know how I can get the missing font families back or re-download them.
MacBook Pro (Retina, 13-inch, Late 2013), OS X El Capitan (10.11.5)