The shax weekly can award strange coins, it's not a "guaranteed" weapon. It's possible you received coins, and didn't notice. It's also possible you received a weapon that was sent to the postmaster. That said, twice in the past, I received nothing at all from completing the bounty. I now make it a habit to record video when I complete it. Not that I would expect to get reimbursed, but as proof, so it can be patched.

Nothing at the postmaster either?

Sometimes it gives you items and not wepons

Do you mean the weekly bounties? Sometimes the reward is strange coins etc. You are not always guaranteed a high light drop or exotic.

There is no bounty from Shaxx that guarantees a weapon to drop.