I love those boots too. <3 (My mother hates them btw. XD)

I think there are sticker stamps in Germany as well, I mean, we have them in Italy, Germany must have them too. The ones I used were normal stamps and, even when I used glue, the stamp vanished. =/ Luckily the letters arrived anyway, I think once my parents had to go to the post office to pick it up, but they didn't have to pay a fee or anything. It's still annoying, though.