Sorry to hear that the bolt fell out. The way things are made these days that bold may be brass plated.
I take it you didn't find water on the floor under the tank. That's interesting in itself. If it has been cycling for some time if you have a raised foundation the sub floor wood may be wet.
Ain't it great to have two terlets?
You appear to be pretty handy. If you go to Home Despot get a sponge to sop up the remaining water in the tank.
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