Misplaced Window

This is the decorative glass in our living room window.

This is where it should be in our foyer window.

This is where the decorative glass from our foyer window is.

Right here.

When Persis owned this house (it was always a rental for her, she never lived in it)she removed the glass window and installed it in her home in town.

What do I do about this? It's even more beautiful then the glass in the other window. It has this different sort of green cast to it.

Do I try to talk to the current owner of the house to try and get it back? When we first bought the house we didn't know that is what happened to the window. We bought replacement glass for it. Do we offer them the replacement glass? Do we just wait for the house to come up on the market again and try to purchase it then?

I think I might have been better off not knowing what happened to it.