Soldato
Try this: https://www.which.co.uk/consumer-ri...n-if-your-parcel-was-left-somewhere-or-stolen
While you likely have agreed that it can be left with a neighbour, they clearly haven't done so.
Definition of neighbour: https://en.oxforddictionaries.com/definition/neighbour
Also, search your postcode and the house number it was supposedly left at. If nothing shows up, it means they've left it with someone at a different post code. By definition, they therefor haven't left it with a "neighbour".
At this point, you want to give them a 24 hour window, by which point you'll be going to the police with the information you have, and trading standards.
While you likely have agreed that it can be left with a neighbour, they clearly haven't done so.
Definition of neighbour: https://en.oxforddictionaries.com/definition/neighbour
Also, search your postcode and the house number it was supposedly left at. If nothing shows up, it means they've left it with someone at a different post code. By definition, they therefor haven't left it with a "neighbour".
At this point, you want to give them a 24 hour window, by which point you'll be going to the police with the information you have, and trading standards.