Hi Ciro, welcome to JD. Well I have cards with these rings on them. Looking at my Droids Fett, I have a half circle next to the left punch & 3 very small half circles on the edges of the card. On the first Carded Fett, I have a very large round impression on the upper right & 2 small edge circles.
Carded Luke: 1 small circle mark like a paper ring reinforcement.
Carded R2: 2 small impressions on the bootm.
Carded Sandtrooper: nothing.
We talked about these rings awhile back in the Return of the Kubricks
thread. Mostly on the 1st carded Fett then I added the Luke & R2. I think these are done by the machines/press when the cards go through a conveyor belt or when the bubble is attached to the card or when the cards are cut.
As for a Be@rbrick Wickett, I don't think any here has one unless Scott has not told us!