I’m not 100% sure if I’m supposed to post threads in this section.
Back in March I sold an item to eBay user nebalda-49. A few weeks ago they left me the following feedback:

However today they’ve opened up a claim stating they never received the item:

I’m hoping eBay’s system is clever enough to know that feedback has already been left.
Looks like they’ve also purchased other Pokémon items from some much larger sellers than me, so figured I’d post here to alert everyone.

Probably wouldn’t hurt to give eBay a call about it. Was my go to when an automated system or rushed ruling was less than ideal.