I think that these expressions change from country to country. Each one has its particularity.
In Brazil we don't have any "standard jargon" for these situations (normally bye or good morning!).
According to the people some kind of joking is possible:
When salesperson returns to the office after daily job:
Hey you're arriving too early for tomorrow! (Hey vocë está chegando muito cedo para amanhã!).
Or when they're leaving the office and backing to home:
Are you already leaving?? (Já vai?) Normally when it's too late (just for fun!)
Leandro.