I found this post which is probably the last option for you, but it may end up being the only option. Good luck and I hope you do not have to resort to this one..
When all else fails:
I'm going to append this little tidbit to this post, because I think it might come in handy to someone.
First of all, I want to say that the instructions here really are invaluable, and my method should only be attempted when the above listed method won't work.
I found myself in that situation. I literally tried for 3 hours to properly hook the bar, and it didn't happen for me. I finally made the decision that one of three things was gong to happen - 1) I was going to have to take it to the shop, and pay a small fortune for them to fix it (if they could), 2) I was going to try something drastic and end up ruining the box and having to pay a small fortune for a replacement, 3) I was going to try something drasting and maybe not end up ruining the box...
You can probably guess, I opted for the last option.
I'll repeat, the above recommendation is the best, if it will work for you.
If it doesn't - I pulled the seat, and used a dremmel too to cut a hole big enough to comfortably put my arm through. Don't be shy on this, if you make it too small, you'll really have a mess when you try to make it bigger.
Be sure to use something that will make a reasonably clean cut. You want a single piece to put back when you're done.
I then got the longest handled phillips screwdriver I could find in my garage, and unscrewed the two latches that lock into the mechanism. There are two screws for each latch. When you get them off, of course the trunk will open.
After I was finished with everything, I used a quality two part epoxy, put the piece back in place, and held it with black duct tape to let the epoxy dry. As it turned out, the black duct tape was so unnoticeable, I just left it in place.
The repaired hole is not visible from outside the trunk unless the seat is removed. I'm sure it's visible from the inside, but most of the gremlins seem to have moved out.
After you're done, reassemble it correctly this time, and learn from your experience. Be sure to check the adjustment on the latch tabs. If they're not positioned well, the trunk won't close properly.
In my case, a pice of the mechanism was underneat the latch bar. This was preventing the "hook the bar" method from working for me.