There were no missing parts, but it was all pot metal (fasteners) and particle board. Knowing it came from China makes me suspicious of what they put in the particle board.
Particle board is perfectly good quality for dry environments, with engineering to ensure structural soundness. The only occasional downside of particle board is its weight.
Unless you’re eating your furniture, you’re probably safe, and don’t need to worry about unhealthy ingredients (what are you worried about?)
Particle board uses some sort of chemical to hold it together which constantly evaporates inside your house until the particle board turns back into dust. China has the absolute worst record in terms of using hazardous substances in their products. They seem to take great pride in turning out "food" containing fake protein and metals mixed with cadmium. Buying their crap is simply insane, but our country lost its sanity a while ago.