Since this question comes up in search engine results, I am going to answer this question, even though it's an older question.
I purchased my home from a real estate agent who had recently bought the home at foreclosure auction. It is my understanding that, at foreclosure, the property is conveyed with all land and all property on it, and any liens are discharged. This is different than REO, where the property never actually goes through foreclosure auction.
That's why, in part, the bank that owns the loan has to place advertisements in the newspaper and such before a foreclosure auction. It gives the opportunity for any interested party to make sure their interests are known, including the opportunity to remove any owned property from the premises.
After we purchased the property, Amerigas started contacting us by mail, offering us service on what they claimed was the "leased" buried tank on our property. We called and spoke with them, and they insisted that the tank was theirs. We disagreed, and told them they should have retrieved the tank before it went to foreclosure auction. At first they were quite belligerent, but they didn't assert any claim after we told them that if they set foot on our property they would be trespassing. They never contacted us again.
Then we called around to other propane providers. Some would not work with us if it wasn't a tank they knew was their own leased tank. Others wouldn't work with us if we didn't have a letter from whoever we "bought" our tank was to prove was ours. Finally, I found a company that was willing to offer us propane delivery and service checks of our tank for a very reasonable price. All we had to do was sign a piece of paper stating that we were the owner of our tank.
It's crazy, they charged HALF of what Amerigas wanted to charge us for propane. This claim by these companies of perpetual ownership of these tanks despite multiple home sales is ridiculous and unethical, and borders on an unregulated monopoly.