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Could just as easily offer it at a public auction or OTC sales without tanking the price. US Marshall Service auctioned off 144k BTC from Ross's Silk Road BTC, rather than placing market orders and tanking the price.

If his intentions are to get the highest price possible, it seems neglegent to not explore an auction or a OTC sale. This implies his motives aren't consistent with his legal responsibility as a trustee, or that he is unaware of these alternatives, imho.

It's funny you mention that. The guy who runs kraken posted on Reddit about the trustee approaching him. He ADVISED NOT to do what they did, instead do an auction. They were even willing to host it.