Sorry this happened to you! We use several third parties to get our descriptions/images/etc. There are many sources online that have pretty much the exact product listing information as Amazon, so we get it from those instead. If you ever feel like you may be infringing on a copyright, it's best to reach out directly to the manufacturer to ask for permission to use the content. eBay rather "suggests" that sellers use their own photos, and it's usually up to the manufacturer to decide whether to try to bust somebody for it. However if you're an authorized seller of their merchandise, they should be able to give you permission to use their images.
For example, we've contacted eBay about a similar issue before and this is what they had to say: "Essentially, the seller may have permission to sell these items or use that imagery, but for one reason or another [company who owns the images] flagged this to our team as a violation. The seller simply needs to realign with [company] to ensure they understand and approve of his selling these items on eBay, and avoid this from happening again in the future."
We're actively working with eBay VeRo to try to make this issue a bit less of an unpredictable pain for our users, but some still are receiving violations that they have to work to undo, or wait out restrictions that are placed on accounts about listing new items, etc. It doesn't happen often, but it does happen.