We purchased almost all of our pins while at WDW. But of course we traded so how do I know if I have a propin or sedesma now? I have purchased a few on ebay but those were because I liked them and they will be a "collection" for one of my kids or I purchased items to complete some series that we started while at WDW so those will be keepers too. I just need to know how to tell what I have for the ones we will be trading next trip so I will know if we have a potential problem with any possible propin or sedesmas.