In The Thomas Crown Affair (1999) a painting is stolen and folded into a briefcase. Crown doesn't even have time to remove the stretchers. The painting is later seen no worse for wear. What magic did he have in that briefcase?
A quote from John McTiernan, the director:
"Anyway we did an elaborate thing of folding the painting into the brief case and people were so offended by it that I sorta hadda cut it out and make it much briefer."