Been there, Done that !Certainly not me. I have more than that loose in the top drawer of my nightstand.
I bought a case of 5.56 from @BIKER13 one time, put it in the trunk of my car and forgot about it until I gave the car away 3 years later. When I was cleaning it out I found that case, plus a case of 7.62x39 I don't even remember where I got. No wonder that car only got 3 MPG.