Unless you force the IC into the antistatic foam, the leads won't penetrate the foam and the chips will be safe in the drawers. Cut the foam to fit the drawer dimensions. You can even stack layers of chips in the drawers if you have a lot of them. Just keep some sort of spreadsheet so you know what is in each drawer. I have never heard of, let alone use, an antistatic spray. I have stored 74LS series chips on the foam in plastic drawers for years without any issues.