A: In that scenarios there's a few different approaches to pursue the owners and the new entity. First LLC owners can be responsible for judgements against the LLC for amounts distributed form the LLC for a period of three years prior to dissolution. Second, this would likely be considered a fraudulent transfer. Both create liability for the owner/s individually, which is counter to the purpose of having an LLC in the first place. It's always a bad idea, but people do it.
A: Irrevocable trusts are required to be registered as are estates subject to probate. Revocable trusts and estates under the probate requirements are not required to be filed with the district court, probate court in Denver County.
The best way to find out is to go to ICCES (https://www.jbits.courts.state.co.us/efiling/web/login.htm) and run a search. If that doesn't find anything you can go to the courthouse and discuss searching the records with the clerk.