This type of key:
(Image credit
https://www.ebay.com.au/itm/255988257050)
All the forum information I’ve seen is either years out-of-date or uninformed “just go to the dealer because you can’t trust locksmiths” type ignorant blather. Or it’s both!
Surely these can now be cloned with a reputable sniffer and cloning rig? Vito owner has only one key and reasonably is concerned that losing it would greatly inconvenience him.