This incident has brought me to a solid conclusion. I need to set aside an area in the house specifically for my writing-related items. That way I will know exactly where everything I need is supposed to be. I won't lie. This probably won't solve my issue of misplacing things entirely, but it can hardly make things worse. There's a corner in my bedroom that I can use. I should get a writing desk too.
If I'm going to try to be a real writer, I need to act like one.