Weapons grade thin mints

Our annual supply of Girl Scout cookies arrived yesterday. We order them from one of Tod’s colleague’s daughters in Chicago and she mails them to us.
This year, the package arrived sealed with Japan Post tape and with a note saying the box had been inspected at Customs. Both boxes of Thin Mints were open.
I wonder if the densely packed cylinders of Thin Mints–18 cookies per roll, two rolls to a box–trigger some sort of weapons alert? Maybe it looks like a pipe bomb.