I probably entered around 500 of those codes at the Golden Giveaway, and my only prizes were 3 $10 off codes for purchases at the Topps online site, which the site said would be emailed to me within 15 weeks.
I've been waiting since Aug of last year for those codes.
Also, I never unlocked a single card out of all those codes!
I was Ok with that at first because I was trying to get the 30 coins unlocked in order to get the Autographed Mays card, but I wound up with 29,29,29 in each category and no matter what I did, no one had the 3 missing coins to trade that would allow me to get there, and none of my codes ever unlocked those 3 coins.
This led me to believe that those 3 coins never even existed in the contest! Or if they did, only a limited number of them were available, but this wasn't mentioned anywhere on the contest site.
I've done a bit of googling, and I know I wasn't the only one that experienced this with that contest, but I've grown to accept it now, because hey, I bought all those packs for the cards...not the contest! lol!