I travelled light with just the underseat bag.
I took the toiletries out, in their clear plastic bag,at security. They went in one tray with my belt, jacket and phone. My bag went in another.
They didn't search my things, but did pull me aside and swabbed things.
Then I packed up and put the trays away. The trays were definitely empty.
When I'm unpacking, no toiletries bag, but I can't see any opportunity to have lost them 😆