The bricks being dropped of in Dallas and these shown, in Frisco, match exactly - grayish/white, plain brick, to a brick that was in a tweet showing a black lady handing back (same type) brick to a Mercedes that was driving around handing bricks out.
City cams have to picking up these brick deliveries and any people handing them out.
A *lot* of the city cams are not reliable, not monitored, or not working period.