What does it do? Do you get an achievement? Thanks :)

you get prizes from using them, sometimes even small amounts of csc. and yes there are achievements for finding/using them

yea i got 11 csc when i used it and the achievement

Yes there's two achievements, for finding and using them.

When did these start?

They've been around for quite some time. I believe they were started in late 2011?

wow, I'm so behind :P Thank you Heilig.