Two possibilities I can think of:
1) Just a plain bad number that got screwed up by the scribbled out CUSIP # deal -- remember that?
2) Maybe with the certs in hand, they discovered the buyback also included nakeds and there were real shares still out. Control of all shares plus those real shares could have temporarily affected the number.
It doesn't make sense to announce a buy-back and then dilute!!
Besides that, if you take into account the 600m that were bought back, the number would be off by nearly 5 billion.
If there actually was dilution, my opinion of the company goes way down, since Sandy would then be unreliable at best.