Warehouse KEY？

[DEPUTY LAOZISHEBAO MINISTER]

I had green, yellow, white,blue, but I can't find the other keys
Where should I find the next key

[MihawkZorro]

You'll get the other Key (orange) if you play further. :) You'll get it. It's for a quest.

[★ Zeenote ★]

Where did you get the blue key?? I spent so long searching but can't find it