How to identify the tape in slots, whether it is used for incremental or daily or monthly ?

Hi all,

I am new to backupExec. We have implemented daily, monthly weekly, yearly backup solutions.  We do have tap library ts3100,where the tapes are in the slots 4 and 5. I want to erase all the datas from tape allocated to daily backup. Now i have 2 tapes in slot 4 and 4 as mentioned earlier, i don't know which tape is really used for daily backup.

so can anyone guide me, how to identify tapes used for daily or monthly  using backup exec 2012,

thanks for your help