the bird seeds were missing, but instead i had a lot of other stuff in my inventory, that wasn't needed anymore. stuff like the magazine, the key or the grease bucket. when i loaded an earlier savegame and progressed until the final scene again, i received a different inventory, containing only the seed, the plush, the pistol and the gumball. i tried this several times and the game seems to choose randomly from these two sets of items. i hope this helps.
Corn is no place for a mighty warrior!