I have gone so far as to write up a description of every cage with exact bowl placement and exactly which foods they love. I have a large note book with dividers, one section for each bird. Medical history, lab results, vet bills (Ugh), food likes and dislikes, etc.
I did this when so many of mine had illnesses and it occurred to me that if I got sick or died no one but me knew how their cages were set up so they were comfy.
Not long ago I took my son thru the process of digging out all the info on each bird so it can go with them someday.
I also have a page in the computer for each bird that covers all of that.
Diana's medications were so complicated that I have sheets describing step-by-step how to compound each drug, then how to dose each one.
I think every little bit helps a new owner and makes the bird more comfy with a move to a new home.
Annie