Ochako had given him something to give to Dabi a while back, but it didn't seem right giving it out so early and it was good to make people sweat. He wasn't their delivery boy even if it made it less dangerous and more convenient. So, the gift card that Dabi gets from Ochako is left for him to find when he decides he's going to come home. Clearly marked and different tone, it's obvious enough which came from whom along with the present that Shigaraki has left for him with a hand written tag on the box that's sitting out on their counter.