I'd just keep it.
On a similar note, I ordered 2 cases of premium hunting ammo with a particular bonded bullet. It was like $24 a box (like 3-4 years ago).
Shipment came and I took delivery and just set it aside.
Couple days later, I got a call from the ammo company and they said they sent me the wrong ammo. I asked them what they sent in error and they informed me the ammo was still the premium ammo, but it had a different bonded bullet that was slightly different than the bullet I'd ordered, and they were out of that particular bullet.
They offered me the option of returning the ammo for a full refund and they'd pay the return shipping, or they would refund my money and I could keep the ammo, and either option came with a 50% off the price of my next ammo order.
Damn! Of course I kept the ammo, the refund, and ordered 2 more cases at 1/2 off the next day.
I have used them several times for different ammo needs since. THAT'S customer service!
