Should match play scores be posted even if I did not hole out on every hole?

Yes. When a hole is started but a player does not hole out, the player must record their most likely score for handicap purposes. (Rule 3.3, Rules of Handicapping).

If the match ends with holes left to play and the players continue to play, the actual scores must be posted on every hole played.

If a match ends with holes left to play and the players do not play the remaining holes, the players should post using the hole-by-hole feature for each hole played and an expected score will be provided for any unplayed holes (keeping in mind at least 9 holes associated with a 9-hole Course Rating™ and Slope Rating™ must be played for a score to be posted). This allows the appropriate Score Differential™ to be calculated from the holes that were played to combine with the expected Score Differential™ for the number of holes not played.