From time to time over the past four months or so I have been receiving phone calls at my work claiming to be representing a secure delivery company that want to arrange for a delivery within a specified time range on a particular date.
Every time they ask for the names of people who should be allowed to sign for the delivery on my behalf, in case I am unavailable.
After the first couple of calls I developed the theory that the callers are not legitimate a delivery company, but could in fact be recruiters looking for contacts.
The most recent call was almost convincing, as they specified an organisation name that could have been legitimate so I gave the receptionist's name. Sure enough no delivery came, but I did overhear a call from a recruitment website who asked for the receptionist by name...