Upload & Sell: On
This may help a bit. There will be some variation, of course, but here are SNs as we acquired them:
2007 - 18xxxxxx, 19xxxxxx, 29xxxxxx, 30xxxxxx, 31xxxxxxx
2008 - 39xxxxxx, 40xxxxxxx, 42xxxxxx, 43xxxxxxx, 46xxxxxx
2009 -- 43xxxxxx, 46xxxxxx, 54xxxxxx, 60xxxxxx,
2010 -- 60xxxxxx, 64xxxxxx, 66xxxxxx, 68xxxxxx, 69xxxxxx, 70xxxxxx, 71xxxxxx
2011 -- 71xxxxxx and higher
FWIW, the IS problems seem to have been solved in late 2009, so if the SN is less than 60xxxxxx I'd inquire about whether the IS unit is original.