Secondhand products are in a gray area, because there’s not a clear consensus on it. Personally, i don’t use those, because i don’t want to spread the idea that those are commodities. Even if it’s secondhand, wearing the skin of an animal as jacket shows that it’s an acceptable behavior. It’s the same for backyard eggs. Of course those chicken aren’t exploited like the vast majority of chicken, but eating those eggs would perpetuate the idea that eggs are food. For example, i wouldn’t eat my pet that died of old age. It isn’t food, it’s a corpse.

As for honey, it’s definitely not vegan. On a lot of regions, honeybees aren’t a native species, and they’re imported to produce honey for humans. In the same time, they decimate populations of native bees, that are far more important for the ecosystem. Also (and i’d like someone to confirm/source it), some honey harvesting techniques are quite brutal and aggressive for the bees.