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Negreanu raises only very strong hands when opening on the SB OOP and limps of the rest I think whatever he thinks he can get away with (not getting raised). One is of course also playing the player, e.g. sometimes it's clear one can raise to steal the blinds, while in many games the BB defends too much and it's not worth trying to steal, and less so when on the SB and OOP. One might get some value from a weak ace (like under AJ or AQ) if one doesn't open-raise with it as in many situations it's not going to get action until its beaten. There also might be many players who raise the small blind open-call (according to mr. green one should try it early on the tournament to get to know what the BB will do, though he might not stick around too long), so if one is to open-limp there at least a clear part of them should be hands one can play back with (could be dangerous, to risk one's tourney or a big amount for such when there is still fish and one would do better to just wait and drop small values, like the 50-50 to 60-40 situations) or rope a dope with big pairs.

One note of a standard SB and BB play on an unraised preflop flop is that the BB/SB might r/cr, or if he bets and one raises and he reraises, these usually mean at least two pair early on the tournament vs. unknown.