Sorry but do you mean put back in use?If so there are a few things,first you need to know who owns them there should be a recessed stamp on them and secondly if there not to old they'll need to be hydrostatic and visual tested.
On a side note a Buddy of mine bought a house two years ago and wants to dump the 250 lbr to the scrap yard,so he spoke with a neighborer and he advised him to check with the locale propane fill up people cause if he scraps it one of the Co,that owns it could stop by and ask him about it's where abouts is
