Mastercraft camos in reserve crates?

Hey guys so I got the replica camo for the mozu in the reserve crates to my surprise and delight. Was I just lucky or are they common? I really want the vampire craft for the vapr and i was just going to buy it but after this replica camo unlock, I'm thinking I might just keep trying for the reserve crates instead. What are the odds? Have any of you gotten lucky with some mastercraft as well?