u/Bel3nits

Hii, im new in this subreddit so if i can't ask this here let me know! (and if not, pleaseee tell me where to ask)

So, i just saw that pocamarket has free shipping if you purchase 20 new photocards starting 05/13 to 05/27, so my question is, can i add the photocards that I already bought in that shipment?? (20 new + the ones i already bought) Or is it only the new ones? I don't want to make another shipment just for those photocards and it is gonna be my first time using this website so im not really sure how it works