I found this bug in my couch

I thought it was normal to see silverfish every once in a while - but that if you see a lot of them it could be a problem.

It's pretty normal to see them in a bathroom or kitchen, as they like damp areas; I have no clue about finding them in couches, tho.

At my last property, silverfish ended up being an indicator of wall studs rotting away.

Excess condensation was dripping off the pipes due to poor insulation & high humidity, exasperated by an addition/extension done by the previous owners which had removed the only nearby exterior ventilation.

In your case, hopefully these silverfish just originated from the factory, or maybe they're there due to dandruff or something. Neutralize them and carry on as normal, if you see more then i would suggest inspecting for damp or calling a professional to look in the walls, taking things from there as you deem best.