did they search the area where the girls were for carpentier's body?

well, it was apparently a significant distance away. so, how did carpentier get from the car to the area to bury the girls?

there's really four possibilities:

(1) he buried the girls first, and then crashed trying to get away. that would appear to be what the cops assumed, but now they can't find him. this would also potentially be stretching time restraints. i've been following this for a while, and it didn't seem to make sense from the start.
(2) he set up an elaborate decoy, like something out of a mel gibson film (and there's lots of ideas to fake your death in films, something i wish cops would pay closer attention to) to trick the cops into thinking he was in a crash, while disappearing in a different direction. but, that really just makes the time issue that much worse, given that they were seen an hour earlier. he'd have had to kill the girls first, then set up the elaborate ruse, then get out.
(3) it rather seems like the more likely scenario is one where the car was forced off the road by another vehicle, and martin carpentier and his three daughters are ordered to get into it. the girls are then killed and buried, maybe as a result of something financial. this would suggest that carpentier ended up in the custody of some kind of third party at some sort. but, i would request that the area that the girls were found in be sorted through more carefully - the three of them may have been killed at once, and they may have missed his body. otherwise, he could be anywhere, dead or alive.
(4) if some entity wanted him and and/or his daughters killed, they could have created the decoy to make it look like a murder/suicide. they just can't find the body.

https://montrealgazette.com/news/local-news/manhunt-for-martin-carpentier-has-been-suspended-sq