Yep! I've had that!
Fun is trying to hide the flex orders from parents. They have to verify the item is right, but they can't see it because the kids will.
Last week I checked in a STS order...two of those 3 foot Elsa dolls. I had a feeling I should just leave them in the brown boxes they were shipped in, so I did. When the guest came to pick them up, she said she didn't want the kids to see them. So she was thrilled when I said they were still in their shipping boxes so I would just tape up the top.
Now, I am pretty sure the two young boys who were with her weren't going to be the recipients of those dolls...but I suspect had they seen them, they would have ruined the surprise for whoever they were for.
And yes, when she returned one of them the next day, we again had to hide it from the kids.