I don't remember when I last bought any new furniture! A lot of pre-owned furniture comes to our house. Some of it is antique, and some is just good used stuff. I'm not saying I pick it up off the sidewalk when somebody puts it out there! But if you go in a thrift store, for instance, you can sit on the sofa, take the cushions off, have them turn the piece of furniture over so you can look underneath, sniff it, ask your dog to sniff it, do whatever you need to do to check it out. If the store objects that that, you don't want to shop there.
I do make it a rule not to buy anything upholstered that doesn't seem solid. A chair or sofa that's a little bit wiggly is only going to get more wiggly, not less. If you sit on it and it feels fine except in one place, check that one place. Inside damage can get worse. If the upholstery is torn, then, yes, I'd wonder what or who was inside. You want to look for a piece that has been given good treatment.
I'd at least go look at the used furniture store you're talking about. In that rent/lease situation, often the piece is fine, but the hotel-owning client changed the style of the hotel rooms, or something like that, and wants new furnishings for that reason. If you have a friend who is knowledgeable about furniture, take him or her along. You could find something really good.