California - Bought REO, Who owns the propane tank?

[Brandon G.]

Hello fellow BPers. Question for those who are familiar with rural properties that have propane service;

Who owns the propane tank when you purchase a REO property in California?

We bought the property about five years ago, now the supplier claims that they own the tank, and we therefore owe them tank rent. It is my assumption that, if the tank was still there when we purchased the property from the bank, it is now owned by us/goes with the property. 

Anyone experienced on how this law works?  Seems like they are trying to pull one over on us. They are currently demanding that we somehow prove that we own it....several years later.

Thanks in advance for sharing your experience/knowledge!