Burned the book. I do not accept that. An ocean of organic molecules will leave a trace.
First until the eater molecules are formed there will be organic materials reacting with , crystallizing on and etching the seascape with evidence of its presence. Second, these artifacts will be treated in exactly the same way as all other fossils are. Soft tissued jellyfish leave traces, they are food. Using Occam's razor your assumption that something unique prevents this evidence from reaching us is an additional factor lopped off with the razor. Thus evidence exists if the pre-biotic soup existed. I don't normally use Occam's razor to prove anything(because it doesn't), but you guys do all the time so what the hay.
The first life arose no later than 3.8 billion years ago prior to that we could assume the prebiotic soup. Very few rocks from this period still exist, which makes hunting for fossils, let alone traces of pre-biotic soup problematic at best. IIRC, there are only two or three places on Earth where rocks from this period still exist and the only one that comes to mind at this moment is in Australia.
There are traces of biomolecules. Antarctic lakebeds, rock formations, extraterrestrial traces (what's their origin?). Preservation is a genuine problem on earth. Evidence of early microorganisms consist of only traces and polymers don't survive degradation. The food issue is not important. Erosion is. Erosion is not unique to prebiotic biomolecules. It's a problem for all old biomolecules, whether they are traces from microorganisms or, later, traces from multicellular organisms.
The prebiotic soup is not the only theory about how life arose. What's your theory?