Kleinanzeigen Experience

Ahoi!

I bought Yeezys from Kleinanzeigen (german craigslist) for 140€ and they started disintegrating within an hour. I seems like the rubber was brittle from the start and the glue weakened a lot. The seller claims that the Yeezys were in perfect condition before being stored for a year.

My question to you guys: has anyone ever experienced something like this?

Is this normal after "a year of storage"?