Green cards can be found as a drop from scientists, and at the lighthouse, super market and Oxum's Gas Station. Blue cards can be found in vending machines at the Outpost or in loot rooms opened by the green card that do not contain a blue door. Red cards can only be found in crates and behind the locked blue doors.

Can you buy keycards in Rust?

These Blue Cards can be found on Scientists or through the Green Doors in Harbor, Satellite Dish, and Sewer Branch. You can also purchase a Blue Keycard at an Outpost for 100 Scrap if you want to do that.

Where can I get blue keycard rust?

The Blue Keycard is an item found in tier 1 monuments except for the Dome. This means that you can find one in these monuments: Sewer Branch, Satellite Dish and Harbor. You can also buy 1 blue keycard from the Outpost for 100 Scrap.