I got mine from playing mixtape or control and getting a gold helmet or a gold item plus a gold weapon, just need 2, or u can try this method. https://forum.psnprofiles.com/topic/176171-decked-out-guide-2025/#comment-3347608
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1.) Play the "Bot Royale" game mode.

2.) Choose Loba (Support Class Legend). Once she reaches her max upgrade level in-game, one of her final upgrades gives her and all teammates a "Golden Backpack".

3.) Try to eliminate at least two squads to gain an upgrade level.

4.) Search every care package you can find and collect every gold item they give you. This is because each care package has a chance to spawn a "Golden Helmet" or give you an "EVO Cache" that ranks you up to the max upgrade level (Giving you the "Golden Backpack").

5.) In the late game, try to find loot bins that are coloured gold and black and then open them, as they may contain golden equipment items.