Wheel Sales Help: Original Audi Wheels 7.5 x 18, 8P060I025AE, ET 54

Hello, I would like your help or your advice! Unfortunately I did not find anything in the search function. I am looking for aluminium rims for my Audi A3 Sportback, Model 8PA, BJ 2011. Now I have found – in my view – a very good offer for the original Audi 18-inch rims Speedline, 8PO60I025AE, ET 54. The rims are offered as new (by a private person, was a classified ad) for a very good price (850,– Euro for the whole set, regular new price) with Audi 833,– per rim!). So my question: Is there any way to see if I’m somehow being tricked? The seller has made a good, very nice impression so far, but I’m stunned by why the things aren’t torn out of his hands like warm semmels. Is there a production year of the rims that you can read? If yes and they were a few years old, would this be a problem? What else could I pay attention to? Do you have tips / warnings / advice f I’m not going there alone, of course, but with my partner. Meeting point is at a gas station where he works (if I understood that correctly). He writes that he doesn’t have a bill. He would have bought it for himself 3-4 years ago, but would have bought a Mercedes and since then the rims would be lying around. Here also all the data that he wrote me off of the rims: Aluminium rims: Speedline, 8PO60I 025AE, ET 54, 7,5×18 H2, T 6, T16B, AIS 17 mg. On the pictures they also look like new (zero brake dust etc.). Would be great if you could give me advice!!! Thank you in advance and dear greetings, Nicole