Well, I'm in the right place but I still cannot move the wooden boxes nor barrels. I've tried so many times, including at other locations. As I said, I've only been able to move what are labeled as packages.

The only two other things I can think of is that it is harder to do because I used a track ball instead of a mouse, or I spoke to the vampire very early on in the game and I don't remember if I killed him then or not. Maybe the latter broke the quest. According to the conversation message in diary, it was about day 4 in the game. Yes, I did talk to Krastus