A recent trial purchase of a small LED bulb was satisfactory - so another half-dozen were ordered. In the bottom of the wrapping was a small sweet lollipop. One bulb was faulty - so they immediately replaced it. Yet another lollipop - just a different colour.
It's quite common for shipments from German eBay sellers to come with a small packet of Haribo[0] sweets.
[0] macht Kinder froh.