Forget accessories, try tiny ponies. I went home for Christmas and I couldn't find the baby sea pony Sun Twist anywhere in my bedroom. Her accessories were on the shelf where I left them, but that shelf is above the bin. For a terrifying moment I thought she'd fallen from the shelf into the bin and been thrown out.
...THEN I eventually found her in the G1 cupboard, sitting smugly under Buttons' hoof. Don't really remember putting her there, but those things are so tiny, they're really easy to lose track of.
As for my accessories, I keep those all in a box now. Before that? Absolutely everything went missing at least once. Some of it is still missing. I found my childhood dance and prance pony boa in the attic of my old doll house, and I still don't know where one of her earrings has gone...