On a recent weekday morning, the Repulse Bay post office, in one of Hong Kong’s most affluent coastal neighbourhoods, stood almost empty. In an hour, only five customers walked through the door, with two staff members serving them.One of them was Dicky Lo, who had sent a parcel to Europe, citing the service’s reasonable price compared with private couriers.“I come here two to three times a month, mostly to collect online shopping packages,” the 43-year-old freelancer said. “Not many residents...