Customs Machinery Keys?

[Dabs4Daze 0]

The 4 Machinery Keys that are part of the Propov quest, are they used for anything else after the quest is complete? Also, why are there 4 of them when you only need 1 to open the tanker door?

I'm basically just wondering if I can sell them/all but one in case I want to keep opening the tanker door.

[Madiakz 425]

Hello @Dabs4Daze

Correct you only need one, it is just a common key. You do not need it for another quest after getting the watch no.