"Arts Parts" refers to a collection of objects that were supposedly anonymously sent to Art Bell.
The "vent" material is very interesting:
That's a much more specific look. Very similar to air-conditioning vents, but on a dollhouse scale.
UPDATE Dec 12 2019 - The following is a summary of the identification from the thread below.
It's almost 100% certain this is a sheet of louvered fins for a heat exchanger (like a radiator or air conditioner).
Here's a VERY good match.
Note the exact same pattern of alternating direction blocks of 10 louvers, with long vertical grooves between the louvers where they are bent into an S-shape.
Here's another example showing the alternating directions of the louver pitches.
View attachment 38972
And another, showing the normal zigzag structure of the fins, with some fins partially flattened.
View attachment 38971
Well done @deirdre, who first found this connection.