Been there with both engine oil and anti freeze. Months a part but from the same store.

This is actually why I check the cap to make sure it's still sealed before input the oil jugs in the cart. I hated the fact that I bought them, went home, drained the old oil from my car. Then went to pour the "new" oil in, only to discovered that someone returned 5qt of used oil. Had to wait for someone to come home hours later.

Months later, same thing with the antifreeze jug. What was worse, they put used green stuff into a pink/orange antifreeze. Two totally different fluids.

It's easy to blame the person who returned the items, but don't forget. There are the employees who should've checked the items first before putting them back on a shelf as "new" or "ok for resale". There's more than one person involved here. The one who did the malicious intent and the dumbasses.

KOT