Virgin 3000, 4500 dump box keys???

[skinerd]

I believe you are correct about the remote key sequence, a memory dump may show boxkeys on these receiver if they are old enough as to not contain any updates. Do a search for "4500 memory dump", might find it. Jtagging is not an option.
The boxkeys may or may not be on the card, you need to get into the card to find out, read up on how to do that. You might try an older NagraEdit version to open that card.