If I prefer to keep my identity concealed from you, that is my own business.

Perhaps The Shadow, his own identity concealed, would use this occasion to decide who really was the Mask!

Again they were meeting The Shadow, though he was still keeping his identity concealed as Dulaine had requested.

His own identity concealed, he would be ready on the morrow.

Percy comes but remains hidden in the shadows, keeping his identity concealed.

Otherwise, so far as he could see, the vessels were anonymous, identities concealed.

He kept his identity concealed most of the time with a blank mask.

Contrarily, by keeping his identity concealed, The Shadow was placing himself beyond redress from local law.

Blade was determined to keep his identity concealed from everybody whose loyalty to the king he didn't trust.

Romney's lack of transparency about his bundlers indicates he is getting money from sources that want their identity concealed.