Purchase through a receivership

If it's anything like items/goods held under a "last will and testament" any an all items that were not specifically willed to a particular person can be transferred to a non-relative for free or for money only as long as every person who was a legal beneficiary (of the will) signs off on the sale. For example, if there are 5 siblings named in the will and they all are equal owners of a certain piece of property (a '69 Swinger) then every single sibling must sign off on the sale of the vehicle for it to be a legal sale. If the car is sold and one sibling is not in agreement with the sale of that item then the sale is NO GOOD and can be revoked. I don't now if items held under a "receivership" come under the same rules but I would imagine that the rules would be similar???
Not quite. Receivership puts a single legal entity in charge of the goods and responsible for their disposition, overseen by the court. No legal challenges to the disposition by others can be made.