I suggest advertising on something local like Craigslist and FB Marketplace in addition to IRV2.com and other forums. I've found that postage/shipping can be prohibitive, even for relatively small items, hence the local angle. I was going to sell a new battery isolator.
Once postage was added to my considerable discounted price, the total was approaching the Amazon Prime price w/free shipping.
It's not too clear as to what you're selling (inside trim for a ceiling fan?) but it sounds like it's going to have a fairly limited buyer pool. On the other hand, if you're willing to give it away, someone may take it off your hands for the price of postage.
2002 Itasca Suncruiser 35U