This has nothing to with tax and other misinformation going around here and other websites. First off, the yellow sticker related to taxes refers articles 9 and 10. On the other hand, the yellow sticker stating articles 28 and 29 refer to goods that are not allowed in all EU member states or that cannot be sold among member states, ie: tobacco related products or, more recently, ecigars and/or ecigars consumables. Dangerous materials such as ion/lithium batteries and so on. Until now, I haven't found one website that explains the truth about this issue.