Those two games were his first two games back. He's been in the OF since. Bags hasn't played in any of the games. While they may very well move him to 1B later in the season (or even tonight for all I know), I wouldn't presume it is a done deal.
However, as the most likely offensive call-ups for the Astros are Scott and Burke - and both are more likely to play OF than 1B, you may very well be correct. But, right now, it looks like he's in the OF for the time being.