When quoting a source like in the anonymous pieces, definitely don't edit them out.

It consists of 100 anonymous pieces for three to ten voices.

It weighed about a ton, and looked like an anonymous piece of factory equipment.

He also has several anonymous pieces, scattered around the world in vaious art museums.

But there are plenty of anonymous pieces, including an old French work table that dominates the kitchen.

She did not want to be an anonymous piece of software somewhere beyond the computer screen.

The first known review to appear was an anonymous piece in the Athenaeum.

This anonymous piece of art, in bronze and no taller than about 50 centimetres, has been here since 1989.

Did you put your name on it or have you done an anonymous piece of homework?

For a newspaper or a magazine to use anonymous pieces is an invitation to mugging.