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[Symmetrick]

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[mprep]

"Search Messages", top left side in your first screenshot, under "Preferences". If you don't remember any single word from that PM, type in "a" (without parentheses) or some other common short word (e.g. "the", "I", "you", etc.) into the "Search for:" field and that should do. Make sure to fill in the "by user:" field as well.

[ranochigo]

I mentioned this quite a while ago and received quite a few interesting responses: https://bitcointalk.org/index.php?topic=5271316.msg55064535#msg55064535.

Sorting by name that is arranged in alphabetical order helps you to bunch the same users together. It is quite a nice way for me to filter out the messages and credits is due to the original answer in that thread.