You got me curious Fred because I would hate to start watching and find something missing. Comparing the list of episodes on Netflix and wiki for season 4.0 and 4.5 everything matches except Netflix lists the last episode as “Daybreak: Part 3” where Wiki lists it as “Daybreak Part 2. Perhaps it was a double length episode?
Other than that Netflix also lists some extra unrated versions of a couple episodes along with the broadcast version.
Only other thing is the Wiki says there were some Webidodes that also pertain to this part of the timeline. Perhaps these are what seems to be missing.
The other most likely thing is that they just sent them to you out of order or one shipped and got returned to them w/o ever reaching you. I’ve had that happen a few times.
http://en.wikipedia.org/wiki/List_of_Battlestar_Galactica_(2004_TV_series)_episodes#Season_4
