Too much liability for a company to take it and resell it.

How much was in there when you moved in? Can you just chalk it up to leaving it as you found it; like a rental car?

If you really want to get it out, find some friends and some 5 gallon containers, pump it out and filter it, because unless the tank is new, you won't want whatever is in the bottom of the tank to come out in the fuel. Is there overlap with your new place. In a day you can make a bunch of runs in between your old and new house, lol.