Not in the job now, but still in touch in many ways. As I understand it, it is now policy to try neighbours first before taking a packet back, dependent on local knowledge...namely, if the postman knows they get on, are likely to be in etc etc.
Re the leaving of stuff, RM gets the blame for everything. Only today on one of the RM Facebook pages, a callers office postman commented how a man had come in demanding his postman was sacked for leaving a packet on a step for anyone to see and steal. That was until it was pointed out it wasn't royal mail that left it. Not saying postmen are perfect, and there are bad ones, but not everything delivered is via them.