If I would buy a card on eBay for example, I paid for it, install it and during registration I learn it is stolen, am I just basically f-ed? I mean, will anyone reimburse me the money I paid for it?
I would assume EVGA won't (since it was stolen from them), police won't, seller won't, eBay will say that it is between me and the seller.
How something like that gets resolved?
This is fine as long as you realise during the initial window (30 days?). I bought a cellphone a few years ago in the UK and 3 months after buying it it just stopped working. I spoke to my network and they told me that the IMEI had been listed as stolen. eBay basically said "it's been too long, nothing we can do".
They just deduct it from the seller (along with a dispute fee, depending on circumstances).
This is especially true with "new" computer parts (lot's of fraud).
This is preventable by the totalitarian combo of serial numbering + point of sales reporting + hardware root of trust + account registration + mandatory activation, though it is also an almost immediate danger against an free and open society.