Here is an update. He was charged with 64 felonies.
Girard Damian Saenz, 58, is charged with 23 counts of possession of an assault weapon, 17 counts of transfer of handgun with no licensed firearms dealer, 15 counts of unlawful assault weapon/.50 Browning Machine Gun rifle activity, seven counts of possession of a short-barreled rifle or shotgun and two counts of possession of a destructive device, the office said.
https://www.wtae.com/article/california-man-charged-after-police-found-more-than-1000-guns-in-his-home/28409524