Wilburforce - 10:19 am on Mar 14, 2013 (gmt 0)
WMT Search Queries is showing dozens of first page rankings for my site which simply don't tally with the real serps for those search terms.
That has been the case with my site for a very long time: my site returns a high number of first-page results, and the number of falsely reported page 1 results in WMT is proportionately very small (probably in the order of 1 or 2% at most).
I do check surprising page 1 results in WMT, and it looks to me like the reported result probably is or has been correct for at least a couple of days: sometimes the result is still there when I check, but gone the following day. However, WMT data are historical, so what you see today reflects some past state of the SERPS, not necessarily their present state.
What you see in WMT today probably doesn't indicate much the future state of the SERPS either (I don't think it should give you any grounds for optimism about what the next update will do).