The ornamental design for a packagingbox, as shown and described.
1. Packaging box
1.1 : Perspective
1.2 : Front
1.3 : Left
1.4 : Top
1.5 : Bottom
1.6 : Perspective
1.7 : Front
1.8 : Left
1.9 : Top
1.10 : Bottom
The broken lines depict portions of the packaging box that form no part of the claimed design; reproduction 1.1 is a front perspective view of the packaging box; reproduction 1.6 is a front perspective view thereof in a condition that the subject design has been folded; reproductions 1.2 and 1.7 are front views of reproductions 1.1 and 1.6, respectively, where the back views are mirror images; reproductions 1.3 and 1.8 are left views of reproductions 1.1 and 1.6, respectively, where the right views are mirror images; reproductions 1.4 and 1.9 are top views of reproductions 1.1 and 1.6, respectively; reproductions 1.5 and 1.10 are bottom views of reproductions 1.1 and 1.6, respectively; this design is for storage or distribution of the accessories of the appliances, such as a cleaner; as you can see in reproductions 1.1 to 1.5, during storage, it is stored in unfolded state; further, as you can see in reproduction 1.6 to 1.10, when the user lifts the handle in the middle of the box, it is folded for easy conveyance.