Considering selling a Weather Guard tool box

The used Tacoma that I bought came with a Weather Guard toolbox on it. I'm back and forth on whether I want to keep it or not. I'm considering selling it and buying a tonneau cover with the money. A quick search on Google shows that this Weatherguard 137 toolbox new costs around $700. The Access Limited tonneau that I'm interested in costs almost $500 on Amazon. If I could get an offer close to the selling price of the tonneau then I might consider selling it. The pain in the butt would be shipping so it would have to be local (New England - close to Boston). The tool box looks and works great. The previous owner put a Harley and an American flag sticker on the inside cover. I'll have to post pictures later if there is any interest.

Thoughts? Should I keep it? Is $500 too much to ask for it used?