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That does seem strange, but I suppose anything could happen with something else in the incubator to absorb and release heat. It's still up to you whether you want to use the old ones, but I think newer is better in this case. I would at least find out everything I could about them...
Unless you like collectables I think I would pass on these. At those prices you can buy a new LG from Tractor Supply. The last one is cheap enough, but I don't think I'd want to use it. Maybe someone else will think they're better than I do. The final decision is yours.