It’s important to know the level of security that you’re dealing with. If you’re selecting a standard lock, then it’s not necessary to provide proof. On the other hand, if you require security access, then it is very important to provide proof for backup purposes in case something happens with your documents. It’s also helpful to know your reasons for needing keys made or remade. For example, if someone else has lost their key and needs one right away, I may ask for secondary identification as well as an official document just in case there are any issues verifying their identity. Lastly, I might want to inquire about whether this is strictly information or whether they simply need keys now because they lost them! Knowing these questions ahead of time will help you stick to the facts and avoid any confusion.