You only need one piece of (timeless) advice regarding what to look for, really: if it looks too good to be true, it almost certainly is. Caveat emptor.
Seriously, ending up with nothing is always a risk you run when buying something advertised as non-functional in the hope of fixing it or recovering any undamaged parts. The fact that the components on this card weren't original is almost irrelevant, because the result would have been the same if they were authentic but damaged beyond recovery.
Someone too lazy to update their listings to reflect a rising sticker price (or not wishing to do so for other reasons) isn't too good to be true. If they're an established business selling new-in-box items at more than the wholesale price they would have paid (around 50% of the lowest sticker price the good's ever been sold at isn't a bad estimate), then you may have found a genuinely good deal.
It's when someone starts selling at below their cost (unless it's obviously to clear out old inventory or the like) that things get suspicious.