Does anyone else receive gifts or is it the same thing every time?

I have used this code a number of times and have been given random items in the past (around 2008) with my order but with my last 2 orders it always seems to be a steel drinks bottle. I just added something to my basket today just to see and its given me another steel drinks bottle.

Has something changed? I emailed customer support but they weren't very clear and said if I use the same code it will be the same item, but there is only one code which is "MYSTERGIFT".

Thanks for any help.