For example... I bought a Roland Blues Cube Artist in mint condition off of Reverb about a year and a half ago for only $475 shipped (which was a good deal all by itself). After I opened it up and plugged it and strarted to play, I noticed a green glow in the reflection off the window. It turns out the person that sold it to the shop I bought it from never told them there was an Ultimate Blues Tone Capsule inserted in the back. I was happy.