used Buying a used gtx 1080, any recomendations?

[RUKNOT]

Hello, I am planning on buying a Palit GTX 1080 Gamerock USED in Russia at around 270$. I think its a good price. I could look at the card and run some tests, what are your recomendations? What should I check, what bechmarks to run and is it a good idea in general to buy used 1080 card. What to look at when I am in person?
He said that the sticker seals are intact, it was never fixed or opened up. 
Lower I'll provide some pictures

[Hiatro]

Definitely Heaven Benchmark and Blender (Classroom for ex.), also try to test the GPU personally if possible