It's a piece of metal. Even if the locksmith doesn't have the blank you can simply make your own on a copying mill. It will take a while because you'll need a fine bit to make a usable key and the registration when you flip it has to be perfect but this is absolutely doable.
The blanks that locksmiths have are an optimization in time and cost, usually not in technology, they are there so you can walk out with your new key in 5 minutes and at $10 rather than an hour or two and $200. The trick is that the blank has all the lengthwise grooves pre-cut and the copying grinder then merely has to slot the blank to the required depth and cut off any excess. This is so that some $7 / hour person can make your keys and not a trained machinist with a very expensive piece of gear.
Keys with tricks in them (magnets, embedded RFID chips, bearings, springs and so on) are a lot harder to copy than keys that are simply steel.
The blanks that locksmiths have are an optimization in time and cost, usually not in technology, they are there so you can walk out with your new key in 5 minutes and at $10 rather than an hour or two and $200. The trick is that the blank has all the lengthwise grooves pre-cut and the copying grinder then merely has to slot the blank to the required depth and cut off any excess. This is so that some $7 / hour person can make your keys and not a trained machinist with a very expensive piece of gear.
Keys with tricks in them (magnets, embedded RFID chips, bearings, springs and so on) are a lot harder to copy than keys that are simply steel.