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If we talking about pullback I think that there is no safe option to be 100% secure.
Account with OG mail can be recovered back same as page without OG.
There is few steps when you buying account without OG mail:
Current email/phone needs to be at least on account 14 days (To prevent any type lock of page from INstagram)
Turning 2FA App and linking FB accounts will most likely avoid any try of pullback (Even if account get recovered, person who recovered will not have acces to page because of 2FA APP so the current owner can always get page back with current email)
Have you ever purchased something from Microsoft before, such as software, a device, or a subscription?
[ ]No
[ ]Yes
Once you have all of these information right Microsoft have an auto-bot to review the information and can easily recover it however the Security and 2fac you apply.
So I think you need to buy from someone you trust.