I'm telling you, I want a job there. Nobody at either of my jobs does stuff like that. They might leave people individualized cards if they leave the company. They might bring a box of donuts or homemade baked goods or chocolates.
But individual cards and treat bags? That I have never seen!

Same here.
A present and a card when people leave, or have a big birthday is normal. We all chip in for that, and someone organises it.
And occasionally someone will bring something homebaked. or treat everyone to a big breakfast spread, usually as a thank you for the present to the birthday or leaving.
That's it. I've never seen individual cards or treats at any of my workplaces ever.