If you didn't know, the Golden Vault has been a feature on the island since it debuted in Season 1 of Black Ops Cold War. To open the Vault, players initially had to complete an Easter Egg, which involved decoding a puzzle to unlock exclusive in-game loot and the Milano SMG Blueprint as a permanent reward.
Unfortunately, this Easter Egg no longer exists in Warzone Season 2 Reloaded, having been replaced with the Warzone Rebirth Keycards; however, you can still get the Red Room Milano Blueprint in the game, and it's never been easier.
How to get Red Room Milano Blueprint on Rebirth Reinforced
Once the match starts, drop in on the ground level of Headquarters, in the building immediately to the left of Nova 6 Factory. You'll notice that the door to the Golden Vault is now open. Head inside and go down the stairs to the underground bunker.

Once inside, you will find the Red Room Milano Blueprint on the table. It's that simple. Similarly to other Easter Eggs, once you have picked up the Milano Blueprint, it should unlock for everyone else on your team. If not, you can drop the Blueprint for each of your teammates to pick up and unlock.
Tip: While you're there, you might as well also pick up Vikhor's Keycard and then head to the Stronghold Vault to redeem $8,000 in Cash a Loadout Drop Marker.
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Stronghold is in the southern part of the island. You can safely reach the location on top of the rooftop and then parachute down to avoid enemies. Next, look for the Satellite Communications Tower in the outermost part of the area and head inside.
Entering through the door on your right will reveal the Vault Room. Then, you can use Vikhor's Keycard to open one of the vaults (Vikhor's Vault is dead centre of the Vault Room)

And that's it. Thank you to YouTuber Ultierior Covert for their walkthrough on how to get the Red Room Milano Blueprint in Warzone. We recommend checking out their channel and subscribing if you enjoy their content.
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Featured image courtesy of Activision via TrippyLeaks.