This keeps changing.
If you can't return them then plant them. Not one of us can guarantee anything.
You plant them this weekend. I don't agree really and think that they look pretty good to me! At this point you plant them, water them well for 6 weeks or so in order for them to establish. Make sure that when you water that you are confident that the whole root mass gets water. I think that they will be just fine.
Yews are fairly hearty.
Dig a proper sized hole for each, set the yew in position and backfill hole 1/2 way with soil, then water so water sits in hole. Start the next yew. By the time you get the second yew in place and water with 1/2 soil, the first one's water should have soaked in. When it has soaked in, complete filling with soil.
Once you have them all planted, top water a bit more. BUT BY FILLING HALF WAY AND WATERING, YOU CAN BE CONFIDENT THAT YOU HAVE GIVEN THEM THE BEST START THAT YOU CAN!
Good luck!!!