Phys 31 First Chapter Exam Answer Key is Missing

Some of my students requested the answers to Phys 31 - Bb First Chapter Exam to be posted. So, two days ago, I put it on the bulletin board in front of Rm 233. But when I passed by this morning, it's not there anymore! . . Could it be possibly because someone was intensely attracted to my handwriting? (Hehe!)

Well I guess it'd be better if I hand over personally the answer key to my students next time.