What method to identify purchase information on slab do you use?

Dealers often affix a label to a coin slab or flip with a code that presumably identifies the purchase date and cost. What methods are commonly used to help identify any info about a coin without having to lookup in an inventory spreadsheet?
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Date puchased is your inventory code, 2200805 is for today
Say bought on Dec 12 1998 : would be 1981212
If more than one coin bought then 2200805.1 or .2 etc
Easy to use excel to sort order of purchase.
For puchased price use a 10 letter word with non repeating letters ie Washington or? Makeup your own
Trans pose with a number for each letter.
Or use any letters word you want or string a long list of numbers and bury cost in among them.
There are many other methods too
Mark your receipt with your inventory code/date file receipts in order to find quickly.
Great code
And would you apply a sticker with the purchase date & cost information to the slab?
I use the method described above and do affix a small, removable sticker to the back of the slab. Sometimes I’ll put a few extra, meaningless letters into the code to throw a clever sleuth off the scent of my code.