If it were my box, I would carefully undo the glue holding it together and open it up flat. i would clean the outside with a paper towel and lighter fluid. this will remove a lot of dirt and some mildew if there is any and in just a few moments it will evaporate completely. I would flip it over and repair all the tears as best i could using gum tape. don't use too much water on the gum tape so it won't soak through and be visible on the outside. Gum tape from the inside, but be sure the image on the outside of the box lines up as best you can. After that drys i would re assemble using hot glue gun glue to reattach the seam. when that is all done i would put it in a box protector (i got one for my chess piece box and my Promotional use only box from Retroprotection, and they are real nice).
Then i would put it up on a shelf for display.
you would be surprised how you can make pretty damaged boxes look quite displayable with a little work and patience . Good luck.
and i learned some of the techniques i use from a youtube channel called ToyPolloi. he focusses on retro toy repairs , but a box is a box. he does nice work and there are two or three videos that focus on just box restoration for display purposes. you are not likely to ever get a box in that condition to be a functional box, but no reason it can't look nice.