That's the smaller type, used in upholstery, typically seats, wraping foam, holding the covers on, that sort of thing. Maybe used to fasten part of the poptop together? Either way, it's an unused one (in use they get crimped closed with hog ring pliers) I've used thousands of those while I had my home based VW seat upholstery business, back in the 90's. Nothing to worry about, just toss it in the trash.
1995 E350 7.3 Diesel, 4x4 high roof camper, UJOR 4" lift