That's tough to tell.
Last fall I had to throw away around 40 pounds of bulbs that were similar to your description.
They looked good until i squeezed them. My fingers sunk into the bulb. When i broke them open, they were all dehydrated and there was some dusty debris like you mention. I assumed bulb mites ruined them. But looking back, I think temps around 65 and humidity under 40 was what dried them out. But the powdery debris was suspicious.
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