A $20 coffee gift card.

Not really worth putting effort into, but if I'd been in charge of the contest I simply wouldn't have awarded the prize, let alone decided to award 3 of them (initially it was only supposed to be one prize) for AI generated content.

The woman in charge was probably happy she got that much engagement in the first place. Low effort, low reward, but look, we're having fun in the office. I wouldn't read too much into it or be sad about it.