sirius as animagus - why didn't the deatheaters know pre OOP?

[laura_clapham2002]

No: HPFGUIDX 93809

During my umpteenth rereading of OOP, the following struck me...

In Voldy War 1 we know that Wormtail was passing information to Voldy 
for a year before his fall.  Yet it is implied in OOP that the death 
eaters did not know this until after Voldy's resurrection - ie Lucius 
Malfoy recognising Sirius at Platform 9 3/4 in OOP.  Why wouldn't 
they have known this before (and therefore made it known during 
POA)?  Wouldn't Peter have been passing this kind of info about the 
members of the Order? IF not why not?  What does this say about Peter?
Or on the other hand, what does it say about the death eaters 
capacity to be efficient, if Voldy does not pass on this kind of 
information?

princess laura