No. If you "top [something] off [with something]" it simply means to make something the final thing to go in a package (real or hypothetical). That item goes on the top so it's the last item.
It doesn't literally have to mean that you are putting those things in a box. I might say:
I'm going to Greece on holiday. I'm going to sail round a few islands, visit beautiful Falassarna on Crete, swim in gorgeous blue skies, go to Athens to see the Acropolis and to top it all off I'm going to Olympus to see the original site of the Olympics!
Get an ice cream cone. Fill the bottom with small chocolate balls. Add vanilla ice cream, then strawberry ice cream, then chocolate ice cream. Squeeze some caramel over it all and top off with multi-coloured sugar sprinkles. Delicious!
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