Itchy hands have knocked the screws on the back of the toilet seat in, come in and help high score

The nut fell in as if it had been washed with water.

Just get another nut and put it on.

If it is metal, you can use magnets, but there is no way to get out of plastic.

Because there is a large C-shaped pipe inside, the opening and exit are on the head of the big C, and it is quite difficult to get out.

The screws should be in the back, and there is no need to remove the glass glue.

A small magnet is attached to the thin wire bolt to suck it out, and since it can fall in, it can be sucked out.

You can find screws of the same model.

Or take a magnet to suck up the screws that have fallen off.

If there is nothing that can be done directly, I suggest you call your local water and electricity renovation person to help you repair it, and you can also ask the owner to help you solve it at the store where you bought the toilet. Hope it helps.