Used Engines

[Deniverdx]

I'm looking to buy a used audi engine but feeling a bit cautious. I’ve seen plenty of listings used engines phoenix az (https://www.blueprismautomotive.com/used-engines-for-sale) for sale online, but how can I be sure I’m getting a good deal? What should I watch out for when buying a used audi engine?
If anyone has advice or has bought a used audi engine before, I’d really appreciate your insights—don’t want to make a costly mistake!
Thanks

[NorthernGTI]

There is a bunch of people parting out Audi's in the UK. Id look there before shipping anything from anywhere else.