I think you can do a hand-off casually with no repercussions, maybe it depends how the people look, are dressed and if you have a good story. I think that you can stand there talking to each other, no big deal.
If these people are not interested in such "games", like one is a sixty year old Doctor from London, forget about doing it that way. What is the package? If it is an envelope of visa invitations to Russia that you need to bring the originals to the Russian embassy in London, for example, it should be very understandable if any security gets excited.