[This video was sped up by 1% to keep within YouTube's time limit.]
It would seem as though Whoopee Camp are the ones who programmed the small degree of fail this game has into it. The seed is still nowhere to be seen, and after I accidentally break the barrel, I can't get it to appear again.
Anyway, I get a few more events done... I'm gonna try to figure out if I can somehow get that seed, or if it's gone forever. If that's the case, I'll just skip to the final boss tomorrow.
I'm in the process of acquiring Tomba 2, which will probably be my next run.