I am not 100% but I do believe this came in a toys r us pack. Just before the DC Universe Logo books they had direct editions that used different logos ( Bullet Logo, Zero Hour Logo, WB Reading Logo , Bat Symbol. ) at the tail end of the multi packs
I believe they more than likely had this as one of those pack fillers. Originally they started with the 2 packs , 20 packs, and character packs. Later were 16 packs and 10 packs as well as some 2 packs. IMO this would have probably been found in either the 2 packs or maybe one of the 10 packs.
@Cpt Kirk