You don't have to purchase the units to get the wrapper. It's either or.
Final Rewards for each part are:
Alliance: Brave SU-37 (A) a:92890 d: 61926 (10% air attack)
Coalition: Brave Marksman (I) a:85149 d:69667 (10% infantry attack)
Federation: Brave Warship (S) a:68119 d:102179 (10% sea attack)
I don't know what the wrapper prize is.