https://mailman.ctan.org/mailman3/hyperkitty/list/ctan-ann@ctan.org/thread/7W7GFQ4LREB6FZUAB3BUBN76G7JBDKDV/
CTAN has a new package: boxhandler - ctan-ann - ctan.org
a newctanpackageann
https://ctan.org/pkg/boxhandler
CTAN: Package boxhandler
ctanpackage