WoW!!! Where in Poland are you? I have relatives near Warsaw and Krakow. I have never been there, but used to help my Gramma get packages ready to send over there back in the day. Bundles actually. We were not allowed to send things in boxes, so everything was wrapped in some kind of heavy muslin. Things were always gone through by the authorities there.
You are amazing doing these quilts....do you need any more donations? I have a lot of fabrics that are cut into squares if this would help. Let me know by PM and we'll see if we can work something out.