Nice!!!

On the outside of my bike box, I wrote in silver Sharpie "Please Re-Tighten All Straps If Opened - Thank You!"

Just kind of a final reminder. Then on the inside, I've just kept the paper packing instructions that came with the box. DH and I have both had the experience of getting a box back with the outer closures loose. (Though I'm still not positive that when it was my bike and I'd already left before he put a few final things in, that he fully tightened the straps as I reminded him. ) Thankfully neither my bike nor his camera gear was damaged, but it was pretty scary. Glad yours went well!