Thanks for your answer. I tried the search you mentioned but it returned the latest event of today, not the one of 2038. (I also tried setting a custom time, but this didn't help either).
To make matters worse, after trying to repair the metadata, Splunkd refuses to start again (Splunkweb starts just fine).
Fortunately this was just a test set-up, I'll start again from scratch and I just hope this problem doesn't return.
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