If it’s not taped incredibly well, you can pry it open. It’s hard if they actually used good tape and/or a lot of tape to close it.

Still with a knife, but carefully. These labels really just mean ‘don’t come whining to us if you act like an orangutan and stab a knife through the box into the item inside’.

Just pull the tape?

With really long nails on your toes.

Tape splitter on your safety cutter

With controlled explosives

Snap it in half over your knee.

Blunt instrument.