I'm wondering how many 0.01BTC prizes were made / found in series 1?
When turning in this redemption card, you “should” get the ballet wallet I circled in the photo below, plus a S1 redeemed card & S1 MR8 Year of the Ox Card. Although I’m not positive if Cardsmiths still has S1 ballet wallets in stock or not, so it’s possible you may get a newer variant.
FYI - This past July I redeemed a Series 1 0.01
BTC redemption card and I got the current version of ballet wallet. I did NOT get any MR card with the shipment as I did when I redeemed in the past. I did get a "Redeemed" card that seemed to match my S1 "Redeemed" cards.

Above shows: Original Series1 Ballet Card ~ Card from this July ~ "Redeemed" Card I got in July as well
I opened several cases of S1 and ONLY got 0.01
BTC redemption cards, they are very common in S1, but rarer in subsequent series. No clue on population totals though. Redemption of the Series 1 card was no different now than in the past and I did not have any issues redeeming the older card now. Hope this helps.
Geo