Most of his net worth will be in assets Lob. Few billionaires will have billions sat in a safe.
Most if not all of his wealth came via USM - considering the sanctions on Usmanov I imagine most of his cash will be difficult to obtain currently.
Unfortunately 777 appear to be the only ones offering what Moshiri deems an acceptable offer. I suspect any other interested party is waiting on the hope of administration to get us on the cheap.
