More likely that they had the 90915-10004 at the first oil change, but no longer stock it (or chose to go with the cheaper filter this time) I would think.
More info about filters:
http://www.elisetalk.com/forums/showthread.php?t=13845
http://elisetalk.com/forums/showthre...7&page=1&pp=20
I didn't see any mention of the 90915-TA002 filter you got, though.