The glass door and its hinge are the weak points on a toaster oven, and crumbs left inside can shift and scratch that glass during the move. A quick clean and cooldown make this an easy pack.
Pro tip: A rubber band or two around the door handle backs up the tape in case it loosens on a long drive.
Watch out: Never pack a toaster oven while it is still warm; trapped heat and moisture inside a sealed box can warp plastic components or cloud the glass.