Black Ops 7 Mystery Box Marksman Rifle is the requirement behind one of the most frustrating Zombies challenges in Camo Costume Party: get 500 kills with a Marksman Rifle obtained from the Mystery Box. Bringing a Marksman Rifle in as your starting weapon does not satisfy the wording, because the challenge specifically cares about where the weapon came from.
The key to Black Ops 7 Mystery Box Marksman Rifle progress is securing the boxed weapon first and then keeping that exact weapon for the kill farm. The challenge belongs to the Zombies track for Zombie Mai Tai and Malignant, so Multiplayer, Endgame and Warzone Marksman Rifle kills do not contribute to this counter.
Black Ops 7 Mystery Box Marksman Rifle requirement
Black Ops 7 Mystery Box Marksman Rifle progress needs 500 Zombies kills with a Marksman Rifle that you physically received from the Mystery Box. The weapon class is not enough by itself. A loadout Marksman Rifle, wall purchase or other source does not meet the stated event condition if it was not the weapon drawn from the box.

How to get a Marksman Rifle from the Mystery Box
The difficult part is the random draw. Use the Mystery Box until a Marksman Rifle appears, then take it and build the rest of the run around that weapon. Because the event condition is attached to the source of the gun, do not swap back to a different copy of the same model later and assume the tracker will treat it identically. Keep the boxed weapon that generated progress whenever possible.
There is no honest way to promise a fixed number of box spins. The Mystery Box is random, and current player reports include very long dry streaks before the correct class appears. The useful strategy is therefore to enter a run prepared to spend points on repeated rolls, secure the class, and only then commit to the 500-kill portion.
How to farm the 500 kills efficiently
Once the Black Ops 7 Mystery Box Marksman Rifle is in hand, Pack-a-Punch and normal Zombies upgrades can make the kill requirement easier to sustain. The event text does not forbid upgrading the boxed weapon after obtaining it. The source requirement is what matters, so improving the weapon for later rounds is preferable to trying to finish 500 kills with an underpowered roll.
Choose a Zombies activity where you can maintain a steady flow of enemies without repeatedly replacing the weapon. The objective is raw kill volume after the correct acquisition condition is satisfied. Track the counter after a round or match segment before spending a full session, because an early check confirms that the game is recognising the boxed weapon correctly.
Why the Marksman Rifle challenge may show zero
If Black Ops 7 Mystery Box Marksman Rifle progress stays at zero, first verify that the weapon came directly from the Mystery Box in that run. The most common source of confusion is using the right weapon class from the wrong acquisition source. Also make sure you are checking the Zombies Camo Costume Party tab rather than a similarly named Marksman challenge in another mode.
If the boxed weapon is correct and kills still do not register, complete the current activity, return to the event screen and check the counter again. A menu can lag behind match progress. A full game restart can refresh the displayed tracker, but it should be treated as a troubleshooting step rather than a guaranteed fix. Persistent account-specific failures should be reported to Activision Support.
How this challenge connects to Malignant and Oozed
Black Ops 7 Mystery Box Marksman Rifle is one of nine Zombies weapon-class tasks. Completing it awards the Zombies event camo for the Marksman Rifle class and moves the tab one step closer to Malignant, the animated Zombies mastery camo. Malignant needs all nine Zombies challenges, not just this one.
Players chasing Oozed must go further again. Oozed requires the four mode mastery camos, so completing the Mystery Box requirement helps finish Malignant, and Malignant then becomes one quarter of the secret-camo requirement. That is why this single random weapon draw can become a major bottleneck for full event completion.
Black Ops 7 Mystery Box Marksman Rifle should be checked in the live Camo Costume Party tracker after each completed requirement.
Black Ops 7 Mystery Box Marksman Rifle should be checked in the live Camo Costume Party tracker after each completed requirement.
Black Ops 7 Mystery Box Marksman Rifle should be checked in the live Camo Costume Party tracker after each completed requirement.
Official source: Call of Duty
