Gabetos is a less common, regional word for 'drawers' or 'compartments', often found in furniture. It's an interesting choice because it's not a word you hear every day in Spanish pop music.
In the context of
Esteman opens "Los Que Fueron" mid-thought: "Decía yo, un rezo más" [I was saying, one more prayer], like we've walked in on a ritual that was already running. He keeps circling one question instead of answering it: where do the people, and the beliefs, we lose actually go? "Cuestionar lo que no ves" [To question what you don't see], he sings, is almost its own punishment.
The chorus never gives him an answer, only the same absence again and again: "Se van y llegan más al olvido" [they go and fall more into oblivion], "Adonde fue y donde esta lo que vivimos" [where it went and where is what we lived]. He never names "los que alteran bases del ritual" [those who alter the foundations of the ritual]; whatever they built dissolves before he can point to it, and the song closes exactly where it started, on "Los que fueron se van" [those who were are leaving].