Only a comment, I've dealt with that with other top boxes with strips of high density foam between the top box and mounting plate. If does have the downside that it falls out of you take the box off, upside that the far larger area does a better job of damping.

 

I recently purchased a new Givi Monokey rack and noticed it comes with two sets of rubber pads, the normal standard ones and a set of longer ones (pictured) which which should help cure a rattling box!

 

LOL my bike came with some foam packing material stuffed in there. That blew away one day, so now I use a dishrag.

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I'll report back with my results.

I realized I failed to deliver on my promise.

My homemade bumpers have worked really well.

One tip - If you're going to install these on your bike in a cold garage in January, they will take forever to cure. I ended up directing my free-standing flood light at them for a couple of hours until they firmed up.

 

I had a similar issue with the rubber vibration pads on my Givi setup, and I ended up trying a different approach too. I used a DIY rubber compression molding method, and it worked surprisingly well! I took some silicone and molded it to fit the spots where the pads were missing.

It’s been holding up great for months now, no more rattling. I was skeptical at first, but it’s been a solid fix. Sugru is a great product, though, so I’m curious to see how that works out for you. The idea of using something like that is genius, and I love that your wife had some extra around!