How to determine Atom 3.0 vs. 3.1

I recently purchased two Atom 3.1 computers (or so I thought) but the box for one says 3.0 while the other says 3.1. Neither have the buddy check feature so I am fairly certain they are both running 3.1 software, but it would be nice to know before I go back to my LDS and ask for a swap. Anyone know how to tell? BTW, the serial number is DL-001182 with a date of 08/11 on the one from the 3.0 box, and the S/N of the one from the 3.1 box is DV-006753 with a date of 6/12. Thanks in advance!

You might find this link helpful:

http://www.scubaboard.com/forums/oceanic/406908-whats-difference-oceanic-atom-3-0-vs-3-1-a.html