I need help identifying unknown objects we found

[Olivia Bauer]

https://youtu.be/pQRiya5_5TE

(Apologies in advance for filming in portrait mode)

My Mom found this stuff in a closet in our office. No idea how old it is. Mom suspects the silver things have something to do with speakers. We also found a role of paper with some measurements on it that came with.

Please help.

[Svengoolie 3]

I think it might be a a set of legs for a large sound bar or possibly some sort of monitor or tv legs.

[Olivia Bauer]

I think it might be a a set of legs for a large sound bar or possibly some sort of monitor or tv legs.

90% certain you're right, thank you.