Releasing Cover Off of Nashua RL02 Pack?

[Lee Courtney]

I have a couple of Nashua brand third-party RL02 packs I'd like to remove
the cover from, shown here:
https://plus.google.com/photos/104239531634140817575/albums/6106851955753108865

The DEC RL02 packs have a slider release on the handle that one can use to
remove the bottom cover before inserting the pack in the RL02 drive.
However, the Nashua packs are missing this mechanism, and just lifting the
handle does not release the bottom cover. Any hints on how to release the
bottom cover off these packs?

Thanks!

Lee Courtney