The answer to this question is "we can not provide you for the answer you are looking for as it doesnt exist". You are trying to purchase drives which are past there prime, and which are being sold because they are aging.
You are also asking a question which involves a lot of variables. This means that anyones answer will be an opinion only, albeit it may be a very informed one.
Information can be drawn from 3 major sources -
BackupBlaze information for drives of this era. Unfortunately, but entirely unsurprisingly as you are looking at HP rebranded SAS disks I could not find any of these drives in the studies, and their usage case is most likely very different to yours.
Google Disk Failure analysis. This is probably to old to provide data on your specific drives, but does show statistical probabilities about failures and causes on hard drives.
Manufacturer data sheets - because these are HP and very specific you would need to go to HP about them. In fact, I think you will find that HP do not provide any "single model" drive information - rather they provide a warranty with their drives and take whatever they can get cost effectively, internally test it and rebrand it.
If you are trying to do a large drive deployment on the cheap, rather then buy secon hand HP branded drives, you should consider purchasing drives from Hitachi (or Western Digital or Seagate - in that very rough order for reliability based on BackupBlaze stats), and stick them in cheap Chinese caddies (which have no electronics in them anyway, so its not high risk). You will also be able to get decent MTBF specs from these companies and more commonly tested drives.