A share bag suits the thank you aimed at a group. A team that pulled together on a deadline, a committee that ran an event, a class of colleagues who chipped in: one bag passed around thanks everyone at once and avoids the awkwardness of singling people out. It is generous in spirit and sensible in cost.
Choose a full hamper for the scale the milestone deserves, lean on a maker with real provenance, https://www.bordbia.ie/industry/origin-green/members-directory/manufacturers/confectionerysnacks/lily-obriens-chocolates/ and add a personal message from the team. Marked that way, a chocolate hamper gives a career the send-off it warrants and leaves the whole office something to share on the day.
A few practical points make personalisation go smoothly. Check the character limit before writing your message, and read the spelling back carefully, since a printed name is permanent and a misspelt one is worse than none. If you are working from an image, use a clear, bright one. Allow extra time in the order, because personalised print adds a step, and longer still if the christening falls near Christmas.
Get the count right with a sensible buffer, place each favour consistently, and order well ahead of the day. The etiquette looks after itself once the logistics do.
Some couples prefer to share a small box between two settings for couples seated together, which trims the count but complicates the table plan. It works, but it asks more of your stationery and place cards, so only choose it if the saving genuinely matters.
One honest note that applies everywhere. If the recipient asks about ingredients or dietary detail, point them to the published product information rather than answering yourself.