From what I've read on the MomsPanel, several of them will, but it seems that much of the same material is in the parks' stores. Each time they answer a question, the "mom" says that a phone call was placed to find out.
Do you know which stores you are planning on going to? Having a list would definitely help the vets know the answer.
What type/style of locket are looking at? We have some at many of our stores around here-including Big Lots, Kmart, Peebles. Of course, they aren't Disney themed.