No, they are not selling them off! So funny, all those sources claiming that utter stupidity. Your article links to another article which links to DPR's wallets:
http://techcrunch.com/2014/01/07/the-silk-roads-libertas-is-free-to-the-annoyance-of-us-authorities/Those wallets (118 mio.$ and 24 mio.$, respectively) have not had any outflow, check them out:
1FfmbHfnpaZjKFvyi1okTjJJusN455paPH
1F1tAaz5x1HUXrCNLbtMDqcw6o5GNn4xqX
Can somebody calculate what would happen if they sold off those wallets fast? How far could that crash the price?
EDIT: I have calculated that it currently would be about 1/68th of the market cap, so I guess that couldn't do too much damage.