yeah, rich folks have minions, you have to market to wealthy folks instead.
put the combination in the delivery instructions. With a computerised lock you could use a different one-time code for each delivery.
You could maybe use the bar-code of the shipping label as the lock code if you can be sure that it's going to do the whole trip on the same label. a cellular video intercom would be another option if you have cellular internet at your place of work.