I did some digging and finally found their Return policy which states 'Returns or exchanges of merchandise purchased from DisneyStore.com can be made to any
Disney Store location in the continental United States in accordance with the in-Store Return Policy, excluding Personalized Items, Art, Limited Edition items (excluding apparel), Vinylmation, Mirrors, Electronics, Indoor and Outdoor Furniture, and Special Order merchandise. All returns must have the original packing slip/receipt with the merchandise to be returned or exchanged.'
Which would suggest that yes I could return it in store, so why did the customer service rep say I can't?

Maybe the purses are considered special order or limited editions? Oh Disney, why do you have to be so complicated?