Inventory them and figure out what you got - vendor, model, color, size, line/back/DB/QB/kicker/.... If they can be used with current helmet inventory you can put them aside. If they don't they to to the youth program or get recycled.
If they can be used you can get them recoated with a new color if they don't match current design. I moved from purple to white 2 seasons ago. Costs a bit of $$ but it really cleans up the look. You can also setup special helmets for auction or something. www.greengridiron.com/ has some interesting ideas.
Otherwise they are fodder for the recycle bin.
If you can’t treat someone with dignity and respect, get out. - Lt. Gen. Jay Silveria youtu.be/WfjZ1otkS3o