I see the crack as post strike damage - the rim appears flattened over the word BOLIVIA but not on the other side of the crack. It is possibly a test done to verify malleability. Put the coin in a vise and bend it. The bend test was used on coins as large as 8R but is most common on 2Rs. If the coin snapped in 2 you had a fake.
It would be much better at this point (just my opinion) if the coin was a contemporary counterfeit and not an original.
I would view the damage as VERY serious on a genuine coin and I would question how it was described by the seller. If clearly described as pre-strike damage, which would be a minting error, that would be adequate cause for return because the description would be in error. If it was described as simple damage of unknown origin then the seller would be right to only accept returns on whatever his stated policy happens to be.