If you got shipped a duplicate order, but the company didn’t charge you, would you keep it?

So 2 weeks ago I ordered some clothes for my daughter through Old Navy. I got an email yesterday stating they wouldn’t be here for a few more weeks and apologized for the delay. Well I had ordered more clothes from Old Navy a couple days after the first order, and they shipped perfectly fine yesterday. Well today, I get another package (thinking it was the first order) well the packing slip listed all the items for the 2nd order (which I already received) but had all different items (same sizes though oddly enough). At first I thought I should just keep them due to my first order not being here and well they are the sizes I needed... but now it’s a few hours later and I’m wondering if I should at least call Old Navy and let them know the error and see if they tell me to keep or to return.... so Im asking to see what I should do on here for a poll 👍🏻👌🏻