Here are eBay pix of Bicentennial Special Packs from a couple of different listings. I didn't get the seller names on either of these. (sorry) Both of these have lots of the white swirls. I'm pretty sure I've had some Bicentennial bags with almost none of them. If I remember correctly there could be wide variation between the contents. I can't recall exactly because I got my bags a long time ago and couldn't resist the temptation to open them. I'll try to keep my next bag sealed. :-)
Actually I got my first bag in 1976 when I was 12. The teeny tiny ones were fun.
If you look closely you can see some Vitros which look like all reds but without red. I mention this because it has been a bit of a puzzle to figure out where those came from if not from all-red bags.
Looks like some Heaton black cat's eyes too.