十二生肖on my table?!

I found a bag on my table on Monday when I reached school. Inside the bag is 十二生肖. I really don't know who put it there. I asked the teacher sitting beside me, but she has no idea as well. I think somebody put that on my table by mistake. Anyway, the 十二生肖 beanbags are cute. I will be leaving it on my table, just in case the person realise his or her mistake and decide to come round to take it back. If not, I will bring it back to Singapore! hee...

Who put them on my table?