I wondered the same thing as I was looking for where the android stores the βextraβ bundles with the account.
This is in the SQLite database (you need to shorten your phone to extract and view it):
/data/system/users/0/accounts.db
You will need to find your account for your application:
sqlite> select * from accounts; 24|john.doe|com.evernote|
Then use the identifier to find additional features:
sqlite> select * from extras where accounts_id = 24; 70|24|userId|8305749
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