Quick question : What makes you think the neighbours will be in for UPS and not for you?
Personally I reckon you are royally ****.
The initial transaction is complete, they have done as requested within their terms and conditions and delivered the thing.
To get it from the neighbour to you will require a whole new booking to get them to go collect and then deliver it to you. They usually require a phone number for both ends, and basically you will only get one attmept to collect if there is no one there and no contact number.
Generally they are quite helpful, and probably the way forward is to ring em, explain your predicament and ask their advice.