There were no clear vantage points that could let people see clearly inside where the blood stains were but there was still some effort made to hide away the bodies to stop them from being seen by anyone that got too curious and tried to look further inside.
Their work was still quite sloppy like they were quite unprepared to handle a more thorough cleanup but it still showed that they were familiar with dealing with dealing with the aftermath after taking the lives of others.
It had been shown how there was very little evidence that was found that could be collected and that a lot of it would be unusable in the end.
If it was a group that was not used to such a thing then they would have surely made a large mistake when dealing with the bodies or they would have left them where they were.