Am I Losing My Mind?

I think I'm becoming senile. I have the ability to misplace something when I've never even left the room. Or could it be that unknown persons are sneaking into my house and car and stealing these items of little value? In the past two weeks I have lost items in my car and in my house. These are things that either have walked out on their own, or, in a fit of amnesia, I threw out. One of them was the entry card to Leisure World, a retirement community where my mother lives. Last week, after taking my mother on some errands, I showed the gate guard the card so I could get back in to take her home. I put the card back into the empty cup holder next to the steering wheel like I always do, and drove past the guard. Well, that was the last I saw of it. Yesterday, before I went to see my mother, I realized it was gone. I suppose it was a good excuse to clean out my car -- which I hadn't done in months -- but even after doing that and searching my purse I couldn't find it. My mother said it wasn't in her purse either. It just disappeared. My washing machine has been known to eat my socks, but is the first time my car has done something just as annoying to me. So now I have to buy a new one, which means a trip to the Leisure World office, or else my mother has to notify the guard every time I show up.