Atarigen, an user in Bnet, who has been posting in one of the ODST Mysteries threads, seems to be pretty good finding Easter eggs: Not only he found
The Sad Puppet, he found something more intriguing:
A list of SI sayings, in the control panels of Data Sacks in Data Hive.
The thing is, the List seems to have some things that have not been heard before: for example, the very first line, that seems to read "CLICKIT OR TICKET" as Atarigen read it.
I can't be certain that there are more of new ones. However, there are many sayings that are little hazy and hard to read, so there COULD be some new ones...
Anyway, if you don't have anything else to do, you could at least
give it a look.