1) investigate old ammo collectors.....some of the boxes themselves may have value for the art etc
2) pull the bullets, dump the powder. The primed brass can be sold also the pulled projectiles can be sold.
You have some cool stuff there, a full brick of .22 ammo, a full M1 Garand clip, vintage shotgun ammo boxes and vintage centerfire ammo. You can check the new California ammo laws that say you can't sell ammo to a private person but you can share ammo with a friend or shooting partner as long as they are not a prohibited person. You must have some fishing buddies who also shoot guns that will take it off your hands.
Well the range has an open lane….
If the surplus stuff they sell still fires I’m sure that still does as well. Give it a shake. Work on your groupings and most importantly clean…clean….clean your barrel after. Enjoy the range time