We have an old chest freezer that has been in storage (turned off!) for 6 years. We now actually have some space in the garage for it, but the mother-in-law says that they are not safe to use after they have been out of commission for so long. Can anyone confirm that she is correct? (There's a first time for everything...)
If you can switch it on and it works and gets down to temperature, I don't see why it wouldn't be safe to use. But I'd invest in a suitable thermometer first so that you can check that it's down to Minus 22 or thereabouts which I believe is the normal temperature of a freezer.