So I have a theory about what happened today with the unexpected gifts.
1) Bungie heard the complaints about the problems redeeming red bull codes and investigated.
2) They realized it was happening and it was their fault, and they had no way to determine who had or hadn't gotten their stuff.
3) so they gave everyone (or a lot of people) every gift they were ever entitled to get in most cases for a second time. That's a legendary weapon, the strange coins from the email sign up, and the same number of focused light that you had ever already redeemed.
That's just a guess based on the small amount of info that I have read.