The writers used the term "galaxy" when they meant "star system."
We're I to retcon this, Krypton's remnants would have been passed to our system by Scholz's star which made a close pass IRL not long ago, explaining how meteorites and the tiny craft made it here...a big hunk knocking one of our ice giants over.
I would have Otis' back story that he was a cooler...a bad luck fixture Lex permitted to be around him because he found the kryptonite in the first place--having met Superman while he was saving a kitten or something.
Otis noticed that the house fire that spooked the cat was from a strange rock-fall.
Otis burns himself with it in a hot potato moment...and drops it such that the fusion crust breaks apart exposing the glow within.
Bad Luck Otis then sees Reeve's character almost faint at the sight of it.
Then that script blurb makes sense what with Lex filling in the pieces and paying good money for other falls within the strewn field.
All this off camera.
A missed opportunity would have been Otis only playing the fool to see how useful Luthor might be---before corrupting Mr. Mannheim further. There was a weather pioneer called "Old Probs" that would fit "Otis" persona...someone who can change probabilities...