That’s an interesting way to go, but I’d probably rather use that for my glasses. Although, I usually have my glasses for quite a few years before finally getting me ones. Well... unless I accidentally break them and have to buy the same frame off eBay. As a side note, semi-rimless are a pain to put the lenses in!
Do you have any sort of scale? I use two different scales for weighing my packages. I have a kitchen scale, which is mostly used for smaller and/or lighter packages. (I think it only supports up to 10 pounds.). For larger and/or heavier packages, I use my bathroom scale. I’ve been doing this for years, and I’ve never had an issue with weight. Honestly, I figured if I’d get yelled at for anything, it would be because I intentionally fib the dimension slightly. Frankly, I can’t stand how you have to round up all the time as sometimes, you’re paying for far, far more volume than your box actually takes up. So, at times, I’ll round up and down to get closer to the actual volume.
Anyway, there’s nothing wrong with using the original box, but one thing I do — especially if the original box makes it larger to ship and potentially more expensive — is emphasize that I’m selling something complete. I also make sure to list out everything clearly in the description in a nice list. On that note, make sure to note that any demonstration-only items used in photos (e.g. TVs for showing off video games) are only for demonstration purposes only. I try to remove liabilities by being specific.