Yeah, you're right, they are from that vintage. I'm in the process of testing now. One thing I notice so far is the IR in very high ~200 m-ohms.I'm guessing a bit, but the pictured pack was probably manufactured in 2006 week 51 (Label code "MCSA0651"), which fits with the modem release year of 2007.
Probably shouldn't expect too much from such old cells. If you do test the cells, please post the results.