Card box

If you don’t have one, someone will need to carry them. A simple basket is fine.

If a box is easy and small then go ahead, otherwise a simple basket is just fine. No need to go over the top. For all you know, they might all bring gifts in lieu of cards!

I'd have something, as others said a basket, or also a cute bag would work! If any of your family usually carries a larger purse they could just collect them and put them in their purse

View Quoted Comment Thanks all! I didn’t know if it would look out of place for such a small amount of people attending

I’d actually just bring a designated tote bag or something where you can store them in an organized way. With such a small crowd, people are more likely to just hand them to you, so having a place you can just tuck them away is perfect. A card box in a small crowd feels a little weird to me in case someone didn’t bring a card and feels awkward about it!