STEAM $20 pc-Mac video gaming cards (STEAMOS) 3 of them with receipts

STEAM $20 3 gaming cards have to sell all of them at a time or it’s not worth it.They are for a PC and Mac . STEAMOS . My brother bought them by mistake and when he tried to return them with receipts they wouldn’t refund his money and he really needs it . He’s not even into video games nor am I . But I might be willing to go down but I want to stay firm on these just because times is rough you heard? They wer bought on 2/16/2025 don’t know how long they are good . Got the activation receipt and store receipt too