Restoring Mail Box

Hello,

I am trying to restore mail box one of my user from Netbackup 7.6.1.1 from date 1/1/2015 to till date, but it's showing a blank data on a perticular mail on a restore menu box.

i got the image on tape which import and duplicate to pure disk and i verfiy the image it's showing the image...but while try to restoring it's showing blank.

please find the attachment and try to give me the proper solution.

Thansk