You shouldn't plug a card if you noticed it's missing some caps. Depending on where they are missing I think you can fry memory chips or the main chips. I don't know much about electronics so I'm just repeating what I remember seeing in videos. If the seller was already missing caps there's a big chance that he or someone before him already plugged the card and maybe fried some chip.

It's definitely a red flag. Without those caps, there's a risk of damaging other components. It's safer to replace them before testing the board

There is only one regulator on a V2 card. If the caps right next to it are there, having the other caps missing won't damage the card in any way. Worst case scenario the card will be somewhat unstable.

Thanks all. I took a chance and it loaded up just fine and recognized the card. Ordered some Nichicon capacitors for it. One of the main chips has some corrosion too on the legs so I have to get it cleaned and reflowed. Should clean up nicely (hopefully).