Help with buying used Sonus Faber Cremona m

What are the risks of buying a very high-end set of Cremona m speakers used from a private party in Poland and shipping them to Texas, US? Maybe for some, this isn't a big risk/investment, but for me, this is huge and I am considering going way over my budget! I was originally looking to buy B&W PM1's (upgrading from my B&W XT2's) but have branched out and am very impressed with the SF Olympica. There's no way for me to budget $6-$10k for a pair of speakers, so I'm looking used for great sounding / looking SF's. If you have any feedback on these, let me know....but also looking for expert guidance on the concerns below.

I have many concerns and looking for some experienced council on how best to proceed.

- how to ensure they are authentic and not black/grey market or copies?
- should I confirm if they were originally purchased at an authorized dealer?
- how do I confirm the production year?
- should I be contacting SF in advance to check serial #?
- should I require a copy of the original receipt?
- how do I know if SF will service them or if there is any warranty and if not, doesn't this drastically reduce their value?
- how do I confirm if they are in perfect condition and perform perfectly?
- how much should it cost to ship from Poland to Texas?
- what is the best way to pay $thousands before I confirm this and before the seller ships (seller won't use PayPal)
- these are the ? I can think of. If you have other insights to share, please do.

Thanks very much for helping with my decision.