Park employee Emily Gibby found the lanyard on Thursday. She said it had a note that read, "Hello, I am autistic and I don't talk much, but I would like to trade for Mickey pins."
The lanyard had a couple of pins attached to it but Gibby added 11 more and posted a picture on Facebook.
The picture has been shared more than 10,000 times on social media.
If you want to claim the lanyard, call Disneyland's lost and found.
Disney is the parent company of 6abc.