How to safely transfer IG account from one proxy to another?

Soon, I will have 3 IG accounts up for sale ( all about 8-10k followers )
They all run on different proxy, have e-mails created on those proxies, and one of them is phone verified.

How do I sell them to a potential buyer without any problems on his part? I want to do it that he/she won't have any problems with verification or any ban cause of changing proxy, what should I do ?

If the proxies from same country you might not get any problem.

Usually get a phone verify when changing proxies.

Can not be avoided.

But using a virgin IP from same country might help.

redarrow said:

If the proxies from same country you might not get any problem.

Usually get a phone verify when changing proxies.

Can not be avoided.

But using a virgin IP from same country might help.

Click to expand...

Ok, so let's say proxies are from US, and the buyer isn't. Should he/she buy himself another proxy from US to handle this account?
About that phone verification, should I get a phone verification for the account before selling it or the buyer should do it after getting an account?