Can Pack of Wonders target cards in the trash to return them to hand?

Ruling: Pack of Wonders can only target cards on the board (gear, units, or hidden cards), not cards in the trash.

Nuances:

• The card works with Treasure Chest because Treasure Chest triggers when it leaves the board (including when returned to hand), not when it goes to trash
• The "owner's hand" specification in the card text refers to which hand the targeted card returns to, not which cards can be targeted
• "Friendly gear, unit or hidden card" means friendly gear, friendly unit, or friendly facedown card