Where did you last see it? Have you checked behind the couch? Under the sofa? Behind the refrigerator?
I'm pretty sure that's one of the items you can craft more than once, so if you really can't find where you put it (and you've definitely checked your inventory by clicking on the item in the crafting table and seeing how many you have on you?) you can try making another?
Or submit a bug problem to
http://contact.bscotch.net/ with the appropriate boxes set to "I have a problem" and give as many details of the issue as you can so Seth and Shi can find it.