I think a lot of them were destroyed, or maybe hidden/trapped like that one was. It was only disturbed by the dwarves digging for Mithril.
This is about numbers:
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Details of their numbers are hard to state with certainty, but there seem to have been relatively few of them - probably no more than seven.
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This is about them hiding:
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In the War of Wrath, Morgoth was assailed by the forces of the Valar. Most of the Balrogs were destroyed in that War, but some few escaped over the Blue Mountains and hid in Middle-earth.
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If there was only seven and most were destroyed, that would leave three at most. Maybe they were still hiding from the Valar?
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“Sylphs of the forest,” I whispered. “Spirits of oak, beech and ash. Dryads of Rowan and hazel, hear us. You who have guided and guarded our every footstep, you who have sheltered our growth, we honour you."
the Forbidden Link