I'm in the DC area.
And no, I don't collect the marks, these are being dumped! They came out of a box that seemed to have an unusually high (to me) number of marks. I accidentally dumped some other before I could take a picture of them. My favorite was one that had, in addition to a simple sharpie line, realistic paint colors on JFK's hair and face.
I am on my first 4 box skunk streak. Have searched approx $10k-$12k in halves and have found 15 40% and 3 90% including a 1939 walker. Also getting them around the DC area. I have seen some of these marks but not as much as a C with a circle around it. 4 more boxes tonight, hoping to end the streak.
Make that 8 straight skunks. I guess this is a legit streak now. Oh well. Maybe I should go back to metal detecting for awhile.
Top middle is mine.