Hi JJJ, welcome to RFF!
The only thing I disagree about is that while the auction was called "anonymous", it becomes obvious in future days and weeks who bid what for each item as they play the available exemptions and so forth. Hence, it isn't really that anonymous.
Also, the Mole wouldn't necessarily bid maximum bids on every item - they are also trying to remain discreet and hidden, so they have to do their moling subtly to avoid detection.
But you could be right - it could be Sam! I think it's Erin, but we'll soon find out!