Dianne had been supervising the students at breakfast this morning, and considering what was happening in the Wizarding World right now, she was more vigilant than usual when the morning Owl post was delivered. Out of the corner of her eye, there was an owl with a package that didn't seem to be approaching any particular student, which was strange behaviour for the owls.
Inspecting the package, it also didn't seem to be addressed to a particular person. It was medium sized, and just wrapped in brown wrapping paper.
She confiscated it and took it to the staff room with her after, and sent messages to a few trusted colleagues to ask for a second opinion. Considering some of the things that had already happened, Dianne felt that they could not be vigilant enough at the moment when it came to protecting the students.