To indicate the existence of an object, the word may is used.

These features indicate the existence of a causeway, later removed.

All indicate the existence of the phenomenon which we call the glass transition.

On the other hand it clearly indicates the existence of the missing higher floors.

However, they do indicate the existence of unhealthy conditions in which more serious trouble could develop.

The index case is the first patient that indicates the existence of an outbreak.

What you describe indicates the possible existence of a highly advanced technology.

This doorway is earlier than the tower and indicates the existence of a mid-12th-century building.

This area indicates the existence of an old lake, today covered by sediment.

He also indicated the existence of two additional outer planets.