I don't have anything to add except, having been on the receiving end of similar debacles, I offer my heartfelt empathy and sympathy.
Once, in the middle of a serious brainfart, I filled my coolant reservoir full of oil. I have no idea what I was thinking or why I did it. It was a heck of a mess to clean up, but everyone here was supportive, sympathetic, and forthcoming with suggestions. Well, one guy decided he wanted to be a total dick, but there's always one in every crowd, right? Sometimes two or three.
Anyway, hopefully you'll find it when you pull the sump pan. The silver lining is that you have an opportunity to examine the sump for other debris. My silver lining was that I changed out the original coolant tank before it failed, which likely would have been soon.
Good luck , dude! Please come back and tell us how it turns out.
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