It's in Replenishment Workload Tool, which there are a few ways to get to. Here's one:
Log into Workbench Intranet on the desktop of any Target computer. At the top select Logistics > Backroom, then click PULL Process in the center of the page, and then Replenishment Workload Tool on the right side. A new window/tab will open, click Replenishment Workload Tool again. Select Trailer Prep > DC Trailer at the top. Check the box on the left of that day's trailer to select it, then click Security Item Report. One tip, I like to sort by container number before printing which makes it a little easier to check off items when receiving them.