Besides the variants on the Stunningly Savage promos, limited to 30, what other exclusive promos were in the 2011 Cult Stuff Mystery Box ? Anyone know ? I thought that there was at least one other promo with a ? on the back...

There was an exclusive Age of Sorcery Chase 1 variant card. This was coloured blue whereas pack pulled Chase 1 variant cards were either Red or Green.

There were 7 cards marked with a '?' and numbered 1 to 30 depending on which Mystery Pack you got. All numbers matched the pack number.

They were

Stunningly Savage P1/P2 uncut & silver glitter
JD Seeber P2
Age of Sorcery blank sketch card (not numbered)
Age of Sorcery MC1 (Mini Chase)
MZF MC1 (Mini Chase)
MZF BD1 (Bookmark)
MZF BD2 (Bookmark)

There were lots of other cards in there too but these were the ones that were 'mystery box exclusives'.

Its worth saying they were hand marked and numbered and basically the same as the regular version of the card. Only two cards, the blue Age of Sorcery and silver glitter Stunningly Savage card, had exclusive features in addition to the '?' and x/30 number.