Unfortunately, there's no way to directly link those purchases and assets to OP LTD in a legal sense. Unless he paid them directly from OP LTD's accounts, of course. And even if that were the case, without the specific receipts and bank records, there's still no proof. Actually, even if there was a money trail, he could also state that those assets have been sold already to gain more liquidity to the company. And he could have even done this legally by selling them to an unaffiliated friend, with a considerable discount (as they were "used goods", you could state the current value fairly low without any doubt), and then "purchase" them back as a private person. He could even state them as "broken in use". Furthermore, with the regular accounting rules (IIRC, it's been a while), you can make a 20% annual value decrease to the real assets the company owns (like buildings and machinery).
So, that's with a lot of "even if"s, to begin with. Without sustainable evidence, it would only hinder my case, and I might even stand accountable for libel, etc.