I suspect they tried to beam them, but your receiver was turned off :-)

Had a parcel due friday. Come friday evening I checked my amazon account to find that the parcels had 'been handed to the recipeint'.
No they hadn't.
Decided to go check if they'd been delivered to my next door neighboyrs - opend my front door and they were on the doormat.
Given that nobody knocked on the door or rang the bell and the dogs didn't hear anyone come through the gate - I can only assume they were beamed to my door and the receiver is built intomy doormat :-)