When the FBI busted the Silk Road website, they confiscated 144,000 Bitcoins. You can check out their wallet here: https://blockchain.info/address/1FfmbHfnpaZjKFvyi1okTjJJusN455paPH. At today’s price, that is $144 Million dollars worth.
Every day the FBI confiscates drugs, cars, houses, guns, and money. Typically they hold these items as evidence. Once the criminal is prosecuted, the items are either destroyed or sold at auction.
As the case of Ross Ulbricht, the owner of Silk Road, comes to a close the FBI has hinted they plan to sell the Bitcoins. Well guess what? The FBI is essentially admitting that Bitcoin is a real currency. If it was not a currency, they would have it classified as contraband and would destroy it.
Keep an eye on their wallet. Once they start selling, they are admitting Bitcoin is for real. Most likely, you can expect a price drop due to high volume selling. Once all of the coins are absorbed by the market the price should recover even higher.