I dont really think I have made any serious coin mistakes. I have purchased or traded for a few coins that did not look as good in person. I just trade those away. No harm done. I love coins for the coin, the design, the message, the pretty colors. If I find the coin pretty I will go after it weather it has a tracking number or not. i currently have several non trackables, a few i have traded trackables for. If anyone has any non trackables they dont want, feel free to email me a list.