You are lucky. I do the same in my listings but I have had my share of faked reasons for returns. One woman damaged a purse deliberately to force a return, and another scammed me completely, returning a worn out purse of a different style instead of the one she bought from me. I've had others not include everything in the package they returned to me, so I end up with an item of less value.
Lately I've been enjoying selling on Poshmark. I haven't had any problems but what's wonderful is that if someone does force a return, the seller isn't out any money. Poshmark pays for the shipping, like Tradesy does. If someone forces a return on ebay, I lose the money I spent to send it and have to pay to return it, and I'm not sure I get all my fees back. On Tradesy and Poshmark, it's like the sale never happened. The difference is that on Poshmark, people know they can't return so most don't try, and you get your money after 3 days, often sooner.