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Oil cap from engine #3. I own an oil cap like this, and this was the first opportunity I had to take a picture of one (I couldn't get above the wing on Witchcraft).

I overheard one of the crew telling another visitor about the oil tanks (presumably in response to a question about the ever-present drips of oil). Apparently, the B-24 (at least the -A model) has oil tanks built into the wing structure, as opposed to having a separate tank structure. This increased the amount of oil leakage. To combat this, the folks who fly Diamond Lil created a "tank within a tank" to cut down on oil losses.