I have made a save that might help people with this bug. Just load up this save on version 0.9.0i and you will have the keycard and a hook in your inventory.
https://drive.google.com/file/d/16eP1eaJxYH4dJWZ7ZoJ3cjbBO4xAb2Sd/view?usp=sharing
You can then put the keycard in your mailbox for your other save! Hopefully this helps someone until its patched.
Also I do believe they are working on a fix in an unstable version right now. This may not be useful for long.