They were probably (maybe?) being straight with you about the aftermarkets (I've never gotten more than $5 for one) but with this one, they should be able to tell how "full/empty" it is and pay accordingly. Just put a rod through the end missing the plug and mark how far it goes. Then compare to the outside. I forget exactly but I think if it went further than half way, it was considered empty and into the Light Iron pile.
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