6 bonsais have been stolen

I couldn't believe it, what I saw opening the window shutter of our balcony door in the morning of 11th May. My bonsais didn't stand there anymore! The following bonsais were stolen:

1 Pedunculate Oak (Quercus robur)
1 Cherry tree (Cornus mas)
1 Field maple (Acer campestre)
1 Fig tree (Ficus retusa)
1 Elm tree (Ulmus parvifolia)
1 Apple tree (Malus with white blooms and green sheets)

I don't have a pictuere of every tree. But please, if you should see one of them, please contact me.

Quercus robur

Cornus mas

Ficus retusa

Ulmus parvifolia