"The costs of storing and maintaining these items during the pendency of the sentencing and forfeiture proceedings may significantly reduce the funds available from their sale."
From the court document.
“The vehicles [bitcoin and Bitcoin Cash] have been seized and are in the custody and control of the United States Marshals Service. Every month, the USMS is accruing $465/month in storage fees for these vehicles. The total expenses for these two vehicles currently is $5,010.70. The BTC and BCH have been transferred to a Government wallet. Due to the volatile market for cryptocurrencies, the BTC and BCH risk losing value during the pendency of the forfeiture proceedings,”
I will gladly hold onto anyone's BTC and BCH for only $450 per month, yes even you USMS!