I found a brand new round basket that was from the 60s or early 70s (don't remember which).
It also just has a card inside like yours & the card has a pre-printed price on it, no other packaging. Thought that was interesting.
I haven't used it & wound up getting a used rectangular one a bit like yours when buying a grill & rotisserie, so I might just bring the round one along to a meetup one day, just to see if I can get anything that I'd be more likely to use. Unless, of course, I get around to trying the rectangular one & like it.