Because the units of beneficial interest are non-transferable, no market exists to determine their fair market value in an established trading market. The holder of a beneficial interest must report his/her share of the income and expenses of the liquidating trust until it is terminated, which is not expected for three years. After the remaining assets are sold and the secured interests and higher priority claims are paid off, the common shareholders will receive a pro-rata share of whatever is left.
IMO, those interests were transferred to somewhere else.