Guys 3rd of 4 shipments that make up my purchase of your annual up front offer was delivered burst open - like the prev 2 but worse. Though positively -no damage to contents - suspect courier may have taken some care after incident this time.
Some low cost suggestions - assuming you've bought boxes in bulk.
Get the reinforced tape that is thick, clear and has reinforcement threads embedded in the tape - Amazon in UK use a weaker paper version if that helps describe it.
Only use it on heavier packages/ or ones where you regularly have issues. Tape up all edges, as well as top and bottom flaps - go wider on flaps by overlapping 3 strips. This will keep costs down and allow you to use your current tape up , as well as existing boxes.
Guesstimates on cost <5eu per roll & cost per box taping <1eu