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1 - Go to your save data utility in the PS3 dashboard
2 - Go into the Borderlands: The Pre-Sequel save files
3 - Find your PROFILE DATA save file, hit triangle, and Copy the PROFILE DATA to your USB
*****Note: You can copy your character saves too, for backup, but the file you are using for the glitch is specifically the PROFILE DATA, not your character save***
4 - Load the game
5 - Go to Concordia to use your keys.
6 - Save and quit the game
7 - Go back to your PS3 Save Data Utility
8 - Go into your USB device this time instead of the Borderlands: The Pre-Sequel saves.
9 - Locate your PROFILE DATA you copied to your USB before using your keys. Hit Triangle, and select Copy and copy back to your PS3
10 - The system will ask you to overwrite save data on PS3, hit yes. Will ask again to confirm, hit yes again
11 - Reload the game to make sure you got your keys back.
You can repeat this process by doing steps 4 through 10, but always do step 11 once you are satisfied and completely done using this method.
I highly recommend saving your Profile Data to your computer first before trying this just in case you mess up.