Rather than sliding the clips as intended, pry the two blue clips at the bottom to unclip them.

Then slide a spudger up the side of the housing. This will break the middle clips and the top clips, but if you didn't break the bottom two, you should be able to put it back together without any issues.

Once you've unclipped (or broken) all 6 of the blue clips, you will need to pry the yellow clips upwards with some force to remove the shell.