According to https://lost-car-keys-replacement.com/toyota/prius/ , you should have the key code. Was it written down in any of your paperwork? If not, that will cost $100 on top of whatever the keysmith charges. In addition, any keysmith you take the car to should: 1. Make sure they cut you an emergency key, in addition to the key fob. 2. Get the key code so replacing future keys will be easier. According to https://priuschat.com/threads/lexus-key-card-fob-compatible.89531/ , the FCC ID must match for us to use the old key fobs. But, according to https://iqkeysupply.com/products/smart-remote-for-toyota-prius-pn-89994-47061 and https://oemcarkeymall.com/products/2015-toyota-prius-keyless-entry-remote-hyq14acx?variant=31841308409956 , it looks like they have different FCC IDs. We could bring along the old key fobs and ask the keysmith if they could be used.