Liner install - Do I keep these in place?

[billfred]

Had new liner installed in the fall. Installer left these things in all the corners. Do they need to stay or can I remove them? Some have fallen out.

 

[wireform]

Do not remove as those are to keep the liner clipped in.

 

[Aquaman7]

That’s a liner lock only cut into small pieces. I had it installed in the whole track.