It wasn't a stem. I've seen plenty of stems, never one that was jointed and yellow...
It looked very out of place in bowl so I plucked it out... As soon as I realized what it was, I threw it in the trash in disgust... I'll try to pick it out and get a picture.
No, it wasn't sealed fresh when I found it. My buddy has the rest of the tub in fact, I'll warn him to be on the lookout.