You are encouraged to order more engraved words than what you need (ordering more words, which you choose in random, makes the odds of your wallet getting hacked close to none, see table below). After the package (or packages) arrive, you will assemble your mnemonic phrase and you’ll be left with more words than what you need. We would recommend not throwing them away, but rather keeping them. Either as decoy around the house as a “fake” set of words, or save them somewhere for your next orders on the site. You will probably have more wallets, needing more sets of words, maybe ones you already got engraved.