First question: The statute does not contain any requirement as color or transparency.Under Illinois law can cases containing unloaded guns be transparent so others could see the gun? Can a magazine of ammunition be kept in the case with the gun?
(iii) are unloaded and enclosed in a case, firearm carrying box, shipping box, or other container by a person who has been issued a currently valid Firearm Owner's Identification Card]
Second question: Yes, ammunition can be with the firearm. The ammunition or magazine can not be in the gun but can be in the same case.
Although the Illinois wildlife code defines a case more stringently, the Illinois Supreme Court reasoned that definition not applicable since the issues did not involve activities covered under the wildlife code.