Or just start the cut in the long direction and slip the knife between the top and bottom flaps for the sides. Assuming whoever taped it didn’t add more tape perpendicular to the main length, though even then you just need to start a cut for each of them. Tip just needs to barely pierce it.
Or a boxcutter that won’t go but so deep. Good ones even have a guide to let you cut around the edges in second for displaying purposes.
Or just start the cut in the long direction and slip the knife between the top and bottom flaps for the sides. Assuming whoever taped it didn’t add more tape perpendicular to the main length, though even then you just need to start a cut for each of them. Tip just needs to barely pierce it.
But where is the honor in that!? /s