RBS and archiving

HI

we have a sharepoint web application in a sharepoint farm and it is enable with RBS. 

we  archived the documents inside documentlibraries in this application using enterprise vault 10.0 

and after archiving i shrinke the database

and db size is reduced but rbs folder size is not changed 

count of rbsid  in  sharepoint content database aldocstreams table  is dobuled 

 

here are the below results before archive and after archive

Before archive:

mdf and ldf file size: 32.4 gb & 3.49 gb 

rbs folder size: 38.5 GB (41,410,355,200 bytes) & 369,243 Files, 6 Folders

select count(*) from AllDocStreams where rbsid is not null : 125080

 

after archive:

mdf and ldf file size: 1.74 GB

rbs folder size: 38.5 GB (41,410,355,200 bytes) & 369,243 Files, 6 Folders

select count(*) from AllDocStreams where rbsid is not null : 250018

here i want to know after archiving why the rbisd number is dobule and 

here how archiving worked and what actually stored in  alldocstream folder after archive finish. in rbsid column