[mothered]

Maybe introducing neighbour is not a good idea however DNA should still work, I don't understand why it wouldn't.

The DNA can well and truly work, but It's not the point.

Due to the Item's value and the nature of the method, do expect an Investigation opened. As such, your neighbor will be part of the equation which will complicate matters with the SE Itself, and your relationship with your neighbor.

So what if I just simply collect it and say it didn't arrived? Putting the neighbour out of the equation.

If the package Is dropped off without an authorizing signature, then yes, the DNA will work.

I'd say an Investigation will be opened, whereby they'll cross-check the consignment with the carrier.