One day I went in Chester Beatty Library. I left my bag in a random locker which had a key with a little wooden plaque for a keyring. Only when I came back to get my things, I noticed that someone had left an inscription RUSSIA and a Biro pen drawing of Russian flag on the back of my keyring. No other messages were left for me though.
Check it out it's the locker number 155. acrylic on wood, 6,5x10cm