Storage Annex Changes Control

So, the only valid cardtext (the one you'll find under "Cardlist", here) is:

Name: Storage Annex
[SW:C/PB, LoB:PG]
Cardtype: Master
Master: location.
Put a card from your hand face down (out of play) on this card when you play it. You may look at the card at any time. During your master phase, you may exchange a card in your hand for the card on this Storage Annex.
Artist: Brian LeBlanc

If the location is stolen, cards on it are move alongside. Just like when you play Spirit Marionnette on a fully-equipped Una.

Well there's just no case I can think of where an opponent's card can end up in ny hand or ash heap. So it's clearly unusual.

Cards "owned" by other players are returned to their ash heap / library, if they would be move to an ash heap / library.