had been sent or has been sent

[Ganesh]

Which one is correct?

1.The Department had been sent all the relevant documents of pension in 2006.

2.The Department has been sent all the relevant documents of pension in 2006.

[RachelsEnglish]

[Mister Micawber]

.
#2 is not correct because you have mentioned a clear past date. #1 is odd when standing alone; there is no call for past perfect. This is the expected:

The Department was sent all the relevant pension documents in 2006.
.
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Native English teacher at Mister Micawber's