Past Perfect

[jack]

http://www.quepublishing.com/article...64262&seqNum=2

This is the text taken from the link above:
1. Now, remember all that information about who the document author was, who had reviewed it, and which computers it came from?

How come they used 'had reviewed'? Where is the second part to it? I don't see it.
What about 'came'? How come they didn't use past perfect there? Like 'had come' ? Why only use it for 'had reviewed' ?

Thanks.

[Tdol]

The had reviewed it before it was published, but the author and the computers remain the same.

[jack]

The had reviewed it before it was published, but the author and the computers remain the same.

Why is it necessary to use past perfect for 'had reviewed'? But not the other ones? How do I know which one to use it for?

[Tdol]

It's not actually necessary- the simple past would work there as well.

[silversea]

It's not actually necessary- the simple past would work there as well.

Yes, I agree with Tdol. If you want to make a clear distinction between what happens first and what happens later, past perfect is called for.