The column on the far right of the table "Properties of kaons" on the Wikipedia page has the common decay modes for a positive kaon. I suppose you can just fill in the antiparticles to get the decay modes for negative kaons. As you can see, neutral or positive pions feature in most of the branches, even when reversed for negative kaons. That suggests that if there are kaons there would be lots of 511 keV electron-positron annihilation photons.
Because the LENR reaction is produced in a Bose condinsate, all radiation produced by decay is absorbed into the condinsate. The 511 keV electron-positron annihilation photons are produced, but they are absorbed. Likewise. all gammas produced by nuclear events are absorbed by the condinsate. In like manner, Holmlid sees billions of neutral fragments produced by fusion but no gammas come out of those fusions and get out of the Bose Condensate that exists on the surface of the metalized hydride.