See the details at dessert-inspired chocolate collection.
There is a practical benefit too. A hamper travels well by post, which matters if you are sending Easter greetings to family you will not see over the weekend. It arrives intact, keeps well, and gives the recipient the pleasure of working through a selection rather than facing one large piece alone.
The date moves, but the method does not. Fix the third Sunday of June in your calendar, count back three weeks, and Father's Day stops being a scramble.
The difference is in the contents. Where an egg is a single large piece of moulded chocolate, an adult hamper is a selection: darker, single-origin pieces, hand-finished pralines, perhaps a share bag to keep back. It rewards slower eating across the long weekend rather than one sitting, which is closer to how most adults actually enjoy chocolate.
The third is presentation. A well-made boxed selection reads as considered on its own, without needing a vase or trimming. It travels by post if you are apart on the day, and it arrives intact rather than needing water within the hour. For a couple spending the evening together, it doubles as something to share after dinner.
Ordering for a workplace rewards a little lead time. Buy the box in the last week of November or the first of December, keep it somewhere cool, and you have a festive gift ready for whichever day the team is finally all in together.