Oh, I'm aware. I find the cones up to a block away, often they've clearly been dragged under a car... and that is okay by me. You can keep a stack on the sidewalk with a sign encouraging others to use them. I had about 15 cones at the peak of my collection one year.
Are you liberating these cones from other locations, or?
They're found abandoned all over. Once you start seeing them, there are lots. Sometimes they're left by ppls gas or by CDOT. I find them on the shoulder in the planned manufacturing district off 35th street. Sometimes they're down on the Bubbly Creek river bank.
I just had to run to my bank in UIC. Here we're two that looked pretty abandoned on the way. The one might be a dibs cone but I usually consider any cones in the Parkway where there is no construction to be up for grabs.
I also have a couple flex posts that I've found in gutters. If the base is intact I keep them. My wife is not always fan of my street artifact hoarding. Lol