[mothered]

What do you think their common reply would be for wrong item? Dont they want the "wrong item" back?

Yes, they will request the return of the wrong Item, so It's crucial to select a "stock Item".

Så find cheapest shoe they sell, buy & claim wrong item?

As long as they stock It, It can be any Item you wish.

To make It worth your while, be sure It's significantly cheaper than the SE Item.