[PeterisP]

Oh I definitely have cases where I'm quite sure that I have had something in my notes and it takes quite an effort to find them.

It is probably relevant to note that I have more than a decade of notes, and more than half of them are not written by me but are excerpts from various relevant resources, scientific papers, etc; so there are cases where, for example, I know that many years ago I had seen an interesting application of method X and should have in my notes, but I don't necessarily remember the exact keywords how it was discussed back then.