I have moved into a flat from a house, and am now experiencing parcels being delivered and just dumped in the communal landing area. We have an intercom system, so I would expect to be buzzed so I can at least meet them downstairs as I appreciate they are on tight schedules so do not have the time to come up all the way to the first floor.
Am I being unreasonable for expecting them to let me know where they are leaving the parcel, personally I think it is quite lazy so not even spend 20 seconds to buzz my flat. I used to be a delivery driver so know it is time constrained, but there is also an element of customer service especially when there is a chance of theft by leaving it in a communal area.