Ok, so let's get this straight.
1. Baron has some unknown amount of libertyreserve. Let's just call it "100$". Baron trades those 100$ libertyreserve for 100$ bitcoin with some random guy he just met in IRC.
2. Baron likes bitcoin, he wants more and decides to deposit 45 000$ worth of libertyreserve to mtgox.com.
4. On February 13th mtgox blocks Barons account and sends an e-mail asking for information regarding the bitcoin trade (1.).
5. Information is provided, nothing from mtgox.

Questions:
1. How is it possible that mtgox knows about your 100$ trade? (you don't know, but try to think)
2. Why is he interested in that trade and not where you managed to get 45 000$ worth of libertyreseve?

It would in my opinion make much more sense if this was the case:
1. Baron trades 45000$ something for 45000$ libertyreserve with some random guy on IRC.
2. Baron deposits 45000$ to mtgox.
3. It turns out the random guy on IRC had stolen those 45000$ somehow and mtgox is getting trouble with libertyreserve.