Same here in Serbia (packages from China). After lots of "failed" delivery notes when there was always someone present, I asked the workers in the post office

Same here in Serbia (packages from China). After lots of "failed" delivery notes when there was always someone present, I asked the workers in the post office why they don't deliver packages anymore (thinking it might be related to country of origin and specific agreements between different postal services regarding fees). They were adamant that delivery was attempted and it must be coincidence. In the end I suspect, in our case, it's more a case of silent protest from the postmen who are payed poorly, so they don't bother carrying the packages.