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Inside clean. It's some Penicillinum Timexum. Nothing else attacked.

I had the same thing with the mouse, which I packed into a box after a few years of use, and recently took it out. In all the gaps, where there is dirt from the hands, that is dust mixed with sweat, dead skin, food debris etc. etc. "something" has grown. And no wonder, because it is, after all, a good medium for various mushrooms. Equipment must be cleaned before packing.

This is what it looks like after 7 months.

Looks good. The question is, was it 7 months in the wardrobe or in use?

Used quite sporadically and lying on a shelf.

As for the keys in Timex, it is a kind of lottery.
I had a Timex in my repair, where some keys were yellow, some gray, and some white, and in one keyboard.
Even my one is similar.